1854	284.9	8
1861	286.6	8
1869	287.4	8
1877	288.8	8
1882	291.9	8
1886	293.7	8
1892	294.6	8
1898	294.7	8
1905	297.7	8
1912	300.7	8
1915	301.3	8
1924	304.5	8
1932	307.8	8
1938	310.5	8
1939	311	8
1944	309.7	8
1953	311.9	8
