published_year,oa_status,graph_type,num_articles
1951.0,closed,closed,120115
1951.0,gold,gold,558
1951.0,bronze,immediate_bronze,14322
1951.0,hybrid,hybrid,1039
1951.0,bronze,delayed_bronze,1500
1951.0,green,green,4138
1952.0,hybrid,hybrid,1084
1952.0,bronze,immediate_bronze,14924
1952.0,green,green,4169
1952.0,bronze,delayed_bronze,1714
1952.0,closed,closed,121927
1952.0,gold,gold,558
1953.0,gold,gold,527
1953.0,bronze,delayed_bronze,1824
1953.0,hybrid,hybrid,958
1953.0,closed,closed,128274
1953.0,green,green,4575
1953.0,bronze,immediate_bronze,16861
1954.0,bronze,immediate_bronze,17819
1954.0,gold,gold,577
1954.0,closed,closed,136184
1954.0,bronze,delayed_bronze,2023
1954.0,green,green,4473
1954.0,hybrid,hybrid,1081
1955.0,closed,closed,140309
1955.0,gold,gold,619
1955.0,green,green,4241
1955.0,hybrid,hybrid,1123
1955.0,bronze,immediate_bronze,19031
1955.0,bronze,delayed_bronze,2154
1956.0,bronze,immediate_bronze,19678
1956.0,closed,closed,146230
1956.0,bronze,delayed_bronze,2228
1956.0,green,green,4349
1956.0,gold,gold,709
1956.0,hybrid,hybrid,1105
1957.0,green,green,4553
1957.0,bronze,delayed_bronze,2277
1957.0,hybrid,hybrid,1291
1957.0,closed,closed,153395
1957.0,bronze,immediate_bronze,21870
1957.0,gold,gold,659
1958.0,gold,gold,703
1958.0,closed,closed,162104
1958.0,hybrid,hybrid,1489
1958.0,bronze,delayed_bronze,2403
1958.0,bronze,immediate_bronze,22702
1958.0,green,green,4671
1959.0,gold,gold,710
1959.0,bronze,immediate_bronze,24848
1959.0,green,green,4940
1959.0,bronze,delayed_bronze,2675
1959.0,hybrid,hybrid,1420
1959.0,closed,closed,173707
1960.0,gold,gold,1122
1960.0,bronze,delayed_bronze,2800
1960.0,green,green,5547
1960.0,closed,closed,184224
1960.0,bronze,immediate_bronze,25274
1960.0,hybrid,hybrid,1599
1961.0,bronze,immediate_bronze,25295
1961.0,hybrid,hybrid,1598
1961.0,gold,gold,890
1961.0,bronze,delayed_bronze,3054
1961.0,green,green,5816
1961.0,closed,closed,193712
1962.0,closed,closed,204571
1962.0,bronze,delayed_bronze,3263
1962.0,bronze,immediate_bronze,25210
1962.0,gold,gold,746
1962.0,green,green,5490
1962.0,hybrid,hybrid,1786
1963.0,closed,closed,222091
1963.0,bronze,immediate_bronze,26545
1963.0,hybrid,hybrid,1784
1963.0,bronze,delayed_bronze,3232
1963.0,gold,gold,1042
1963.0,green,green,6459
1964.0,closed,closed,235480
1964.0,hybrid,hybrid,1770
1964.0,bronze,immediate_bronze,27536
1964.0,gold,gold,1018
1964.0,green,green,6058
1964.0,bronze,delayed_bronze,3572
1965.0,green,green,5891
1965.0,gold,gold,1127
1965.0,bronze,immediate_bronze,29460
1965.0,closed,closed,251201
1965.0,hybrid,hybrid,2190
1965.0,bronze,delayed_bronze,4208
1966.0,bronze,delayed_bronze,4256
1966.0,closed,closed,267356
1966.0,gold,gold,1146
1966.0,bronze,immediate_bronze,31054
1966.0,green,green,5830
1966.0,hybrid,hybrid,2175
1967.0,bronze,delayed_bronze,4626
1967.0,green,green,5865
1967.0,closed,closed,283297
1967.0,bronze,immediate_bronze,34352
1967.0,hybrid,hybrid,2378
1967.0,gold,gold,1427
1968.0,gold,gold,1416
1968.0,bronze,delayed_bronze,5220
1968.0,hybrid,hybrid,2334
1968.0,closed,closed,297813
1968.0,green,green,6110
1968.0,bronze,immediate_bronze,35558
1969.0,hybrid,hybrid,4659
1969.0,bronze,delayed_bronze,5775
1969.0,closed,closed,307186
1969.0,green,green,6860
1969.0,gold,gold,1591
1969.0,bronze,immediate_bronze,37426
1970.0,hybrid,hybrid,5648
1970.0,green,green,6795
1970.0,closed,closed,343682
1970.0,bronze,immediate_bronze,40450
1970.0,bronze,delayed_bronze,5726
1970.0,gold,gold,2249
1971.0,hybrid,hybrid,2645
1971.0,gold,gold,1911
1971.0,green,green,6767
1971.0,bronze,immediate_bronze,38961
1971.0,bronze,delayed_bronze,6649
1971.0,closed,closed,353179
1972.0,closed,closed,377203
1972.0,green,green,7557
1972.0,hybrid,hybrid,2632
1972.0,bronze,delayed_bronze,7827
1972.0,gold,gold,1778
1972.0,bronze,immediate_bronze,39325
1973.0,closed,closed,389957
1973.0,green,green,6911
1973.0,bronze,delayed_bronze,8216
1973.0,bronze,immediate_bronze,40075
1973.0,hybrid,hybrid,2890
1973.0,gold,gold,1857
1974.0,green,green,7271
1974.0,bronze,delayed_bronze,9115
1974.0,bronze,immediate_bronze,40957
1974.0,closed,closed,397641
1974.0,gold,gold,2356
1974.0,hybrid,hybrid,2742
1975.0,bronze,immediate_bronze,40575
1975.0,gold,gold,2115
1975.0,closed,closed,409699
1975.0,hybrid,hybrid,2729
1975.0,green,green,7863
1975.0,bronze,delayed_bronze,8836
1976.0,closed,closed,420102
1976.0,gold,gold,2191
1976.0,green,green,8727
1976.0,bronze,immediate_bronze,43758
1976.0,bronze,delayed_bronze,9008
1976.0,hybrid,hybrid,3811
1977.0,hybrid,hybrid,3709
1977.0,bronze,delayed_bronze,9444
1977.0,gold,gold,2158
1977.0,green,green,9874
1977.0,bronze,immediate_bronze,44625
1977.0,closed,closed,440897
1978.0,hybrid,hybrid,4026
1978.0,green,green,10403
1978.0,closed,closed,457186
1978.0,bronze,immediate_bronze,46888
1978.0,gold,gold,1924
1978.0,bronze,delayed_bronze,10386
1979.0,closed,closed,474203
1979.0,hybrid,hybrid,4540
1979.0,green,green,11008
1979.0,bronze,immediate_bronze,45516
1979.0,bronze,delayed_bronze,10909
1979.0,gold,gold,2212
1980.0,bronze,delayed_bronze,11707
1980.0,green,green,11508
1980.0,gold,gold,2511
1980.0,closed,closed,496342
1980.0,bronze,immediate_bronze,48234
1980.0,hybrid,hybrid,4316
1981.0,bronze,delayed_bronze,12244
1981.0,bronze,immediate_bronze,51692
1981.0,hybrid,hybrid,4452
1981.0,gold,gold,2294
1981.0,green,green,11814
1981.0,closed,closed,520999
1982.0,bronze,delayed_bronze,12301
1982.0,gold,gold,2285
1982.0,bronze,immediate_bronze,50809
1982.0,green,green,12434
1982.0,closed,closed,535798
1982.0,hybrid,hybrid,4602
1983.0,closed,closed,564413
1983.0,bronze,immediate_bronze,53495
1983.0,bronze,delayed_bronze,13530
1983.0,gold,gold,2511
1983.0,green,green,12906
1983.0,hybrid,hybrid,5020
1984.0,bronze,delayed_bronze,14017
1984.0,hybrid,hybrid,5038
1984.0,closed,closed,589314
1984.0,gold,gold,2873
1984.0,bronze,immediate_bronze,57794
1984.0,green,green,14078
1985.0,gold,gold,2908
1985.0,bronze,delayed_bronze,15151
1985.0,bronze,immediate_bronze,59086
1985.0,closed,closed,613446
1985.0,green,green,14188
1985.0,hybrid,hybrid,5098
1986.0,bronze,delayed_bronze,17106
1986.0,closed,closed,636250
1986.0,bronze,immediate_bronze,60598
1986.0,gold,gold,3107
1986.0,green,green,14959
1986.0,hybrid,hybrid,5856
1987.0,hybrid,hybrid,5998
1987.0,gold,gold,3693
1987.0,bronze,immediate_bronze,65598
1987.0,closed,closed,651947
1987.0,bronze,delayed_bronze,17903
1987.0,green,green,15625
1988.0,closed,closed,680648
1988.0,bronze,immediate_bronze,66124
1988.0,bronze,delayed_bronze,19089
1988.0,green,green,17303
1988.0,hybrid,hybrid,6727
1988.0,gold,gold,3622
1989.0,gold,gold,3904
1989.0,bronze,immediate_bronze,68519
1989.0,hybrid,hybrid,6773
1989.0,bronze,delayed_bronze,20049
1989.0,closed,closed,715909
1989.0,green,green,17952
1990.0,bronze,immediate_bronze,69976
1990.0,hybrid,hybrid,7354
1990.0,bronze,delayed_bronze,22887
1990.0,green,green,19644
1990.0,gold,gold,4263
1990.0,closed,closed,748460
1991.0,green,green,19948
1991.0,gold,gold,5081
1991.0,bronze,immediate_bronze,72374
1991.0,bronze,delayed_bronze,24464
1991.0,hybrid,hybrid,7060
1991.0,closed,closed,772950
1992.0,gold,gold,6128
1992.0,closed,closed,803912
1992.0,bronze,immediate_bronze,72242
1992.0,bronze,delayed_bronze,23873
1992.0,hybrid,hybrid,7182
1992.0,green,green,21973
1993.0,hybrid,hybrid,7789
1993.0,green,green,25849
1993.0,bronze,immediate_bronze,77833
1993.0,gold,gold,6005
1993.0,closed,closed,827787
1993.0,bronze,delayed_bronze,24355
1994.0,green,green,30241
1994.0,bronze,delayed_bronze,27360
1994.0,hybrid,hybrid,8286
1994.0,gold,gold,7236
1994.0,closed,closed,856382
1994.0,bronze,immediate_bronze,75885
1995.0,closed,closed,909792
1995.0,bronze,delayed_bronze,37372
1995.0,hybrid,hybrid,8910
1995.0,gold,gold,8280
1995.0,bronze,immediate_bronze,78828
1995.0,green,green,33878
1996.0,hybrid,hybrid,8595
1996.0,gold,gold,10007
1996.0,bronze,immediate_bronze,98547
1996.0,closed,closed,937243
1996.0,bronze,delayed_bronze,43705
1996.0,green,green,36140
1997.0,closed,closed,960718
1997.0,green,green,39995
1997.0,hybrid,hybrid,9234
1997.0,gold,gold,13699
1997.0,bronze,immediate_bronze,97139
1997.0,bronze,delayed_bronze,47166
1998.0,closed,closed,967476
1998.0,bronze,delayed_bronze,49574
1998.0,green,green,43865
1998.0,gold,gold,16117
1998.0,bronze,immediate_bronze,100488
1998.0,hybrid,hybrid,9976
1999.0,bronze,immediate_bronze,106172
1999.0,closed,closed,973450
1999.0,green,green,47981
1999.0,gold,gold,18688
1999.0,bronze,delayed_bronze,49421
1999.0,hybrid,hybrid,11464
2000.0,bronze,immediate_bronze,107233
2000.0,gold,gold,22296
2000.0,hybrid,hybrid,13491
2000.0,closed,closed,1030478
2000.0,green,green,53975
2000.0,bronze,delayed_bronze,57671
2001.0,closed,closed,1054596
2001.0,bronze,immediate_bronze,108540
2001.0,gold,gold,26742
2001.0,bronze,delayed_bronze,64095
2001.0,green,green,59042
2001.0,hybrid,hybrid,14232
2002.0,green,green,64181
2002.0,closed,closed,1064414
2002.0,bronze,immediate_bronze,121316
2002.0,gold,gold,31444
2002.0,bronze,delayed_bronze,68174
2002.0,hybrid,hybrid,16952
2003.0,bronze,immediate_bronze,126297
2003.0,bronze,delayed_bronze,72971
2003.0,green,green,71988
2003.0,gold,gold,36057
2003.0,closed,closed,1115946
2003.0,hybrid,hybrid,20271
2004.0,gold,gold,43856
2004.0,bronze,delayed_bronze,78954
2004.0,hybrid,hybrid,21673
2004.0,closed,closed,1216056
2004.0,bronze,immediate_bronze,135207
2004.0,green,green,80682
2005.0,gold,gold,55937
2005.0,bronze,delayed_bronze,77630
2005.0,hybrid,hybrid,25470
2005.0,closed,closed,1248054
2005.0,green,green,93902
2005.0,bronze,immediate_bronze,141025
2006.0,hybrid,hybrid,27999
2006.0,gold,gold,65206
2006.0,bronze,delayed_bronze,81694
2006.0,green,green,111119
2006.0,closed,closed,1362868
2006.0,bronze,immediate_bronze,144189
2007.0,bronze,delayed_bronze,83173
2007.0,green,green,127695
2007.0,closed,closed,1425824
2007.0,hybrid,hybrid,37321
2007.0,bronze,immediate_bronze,150961
2007.0,gold,gold,76733
2008.0,bronze,delayed_bronze,84931
2008.0,hybrid,hybrid,49195
2008.0,green,green,153602
2008.0,closed,closed,1484973
2008.0,gold,gold,103828
2008.0,bronze,immediate_bronze,163041
2009.0,gold,gold,127934
2009.0,closed,closed,1591170
2009.0,hybrid,hybrid,59721
2009.0,bronze,delayed_bronze,93481
2009.0,green,green,171979
2009.0,bronze,immediate_bronze,181097
2010.0,bronze,immediate_bronze,197306
2010.0,gold,gold,173283
2010.0,green,green,179707
2010.0,hybrid,hybrid,70001
2010.0,bronze,delayed_bronze,96877
2010.0,closed,closed,1562161
2011.0,bronze,immediate_bronze,216195
2011.0,gold,gold,210645
2011.0,closed,closed,1606151
2011.0,bronze,delayed_bronze,101583
2011.0,hybrid,hybrid,95562
2011.0,green,green,188496
2012.0,bronze,immediate_bronze,236041
2012.0,bronze,delayed_bronze,103526
2012.0,hybrid,hybrid,111576
2012.0,green,green,199865
2012.0,closed,closed,1672831
2012.0,gold,gold,278615
2013.0,gold,gold,339545
2013.0,bronze,delayed_bronze,101542
2013.0,green,green,221376
2013.0,closed,closed,1759022
2013.0,bronze,immediate_bronze,267584
2013.0,hybrid,hybrid,134065
2014.0,gold,gold,424926
2014.0,closed,closed,1789094
2014.0,green,green,224185
2014.0,bronze,delayed_bronze,98728
2014.0,bronze,immediate_bronze,273497
2014.0,hybrid,hybrid,162681
2015.0,bronze,immediate_bronze,289154
2015.0,closed,closed,1778887
2015.0,gold,gold,506696
2015.0,bronze,delayed_bronze,96440
2015.0,hybrid,hybrid,203239
2015.0,green,green,238851
2016.0,green,green,264891
2016.0,bronze,delayed_bronze,94719
2016.0,bronze,immediate_bronze,313888
2016.0,hybrid,hybrid,242629
2016.0,gold,gold,593631
2016.0,closed,closed,1831853
2017.0,closed,closed,1817983
2017.0,hybrid,hybrid,261967
2017.0,green,green,259264
2017.0,bronze,delayed_bronze,87985
2017.0,bronze,immediate_bronze,340050
2017.0,gold,gold,706663
2018.0,closed,closed,2152492
2018.0,bronze,delayed_bronze,67071
2018.0,bronze,immediate_bronze,348595
2018.0,hybrid,hybrid,277485
2018.0,green,green,233139
2018.0,gold,gold,853648
2019.0,bronze,immediate_bronze,208186
2019.0,green,green,82802
2019.0,closed,closed,1580473
2019.0,hybrid,hybrid,152178
2019.0,gold,gold,710272
2019.0,bronze,delayed_bronze,13809