Year,Zn
1900,479000
1901,510000
1902,547000
1903,574000
1904,629000
1905,660000
1906,704000
1907,738000
1908,723000
1909,775000
1910,810000
1911,895000
1912,971000
1913,939000
1914,795000
1915,760000
1916,882000
1917,901000
1918,849000
1919,719000
1920,682000
1921,464000
1922,730000
1923,889000
1924,986000
1925,1190000
1926,1410000
1927,1420000
1928,1360000
1929,1320000
1930,1260000
1931,904000
1932,709000
1933,892000
1934,1060000
1935,1210000
1936,1330000
1937,1470000
1938,1420000
1939,1500000
1940,1470000
1941,1590000
1942,1630000
1943,1830000
1944,1870000
1945,1470000
1946,1440000
1947,1600000
1948,1690000
1949,1730000
1950,2150000
1951,2360000
1952,2590000
1953,2670000
1954,2660000
1955,2900000
1956,3110000
1957,3150000
1958,2950000
1959,3020000
1960,3090000
1961,3490000
1962,3570000
1963,3660000
1964,4030000
1965,4310000
1966,4500000
1967,4840000
1968,4970000
1969,5340000
1970,5460000
1971,5520000
1972,5440000
1973,5710000
1974,5780000
1975,5850000
1976,5690000
1977,5920000
1978,5850000
1979,5990000
1980,5950000
1981,5950000
1982,6130000
1983,6280000
1984,6520000
1985,6760000
1986,6840000
1987,7190000
1988,6770000
1989,6820000
1990,7150000
1991,7270000
1992,7250000
1993,6910000
1994,7050000
1995,7280000
1996,7480000
1997,7540000
1998,7570000
1999,7960000
2000,8770000
2001,8910000
2002,8880000
2003,9520000
2004,9600000
2005,10000000
2006,10300000
2007,11100000
2008,11900000
2009,11600000
2010,12300000
2011,12500000
2012,13300000
2013,13200000
2014,13500000
2015,13700000
2016,13800000
2017,13800000
2018,NA