Year	Kilotonnes
1850	0.00002
1851	0.00002
1852	0.00004
1853	0.00006
1854	0.00008
1855	0.0001
1856	0.00012
1857	0.00014
1858	0.00016
1859	0.00019
1860	0.00021
1861	0.00041
1862	0.00061
1863	0.00082
1864	0.00102
1865	0.00122
1866	0.00143
1867	0.00163
1868	0.00184
1869	0.00204
1870	0.00225
1871	0.00245
1872	0.00266
1873	0.00287
1874	0.00309
1875	0.0033
1876	0.00351
1877	0.00372
1878	0.00394
1879	0.00415
1880	0.00436
1881	0.00494
1882	0.0046
1883	0.00463
1884	0.00466
1885	0.00513
1886	0.0056
1887	0.00607
1888	0.00656
1889	0.00729
1890	0.0077
1891	0.00649
1892	0.00837
1893	0.00731
1894	0.00909
1895	0.00803
1896	0.00903
1897	0.01017
1898	0.01052
1899	0.01061
1900	0.01268
1901	0.01381
1902	0.02762
1903	0.04143
1904	0.05523
1905	0.06904
1906	0.08285
1907	0.09666
1908	0.1105
1909	0.1243
1910	0.1381
1911	1.989
1912	5.674
1913	14.86
1914	20.37
1915	25.91
1916	42.43
1917	52.1
1918	38.07
1919	43.96
1920	36.32
1921	58.46
1922	79.8
1923	106.6
1924	156.4
1925	163
1926	145.3
1927	157.1
1928	198.1
1929	226.4
1930	242.4
1931	206.8
1932	93.33
1933	115
1934	186.5
1935	182
1936	164.5
1937	252.9
1938	208
1939	205.5
1940	245.8
1941	265.7
1942	268.6
1943	253.7
1944	263.5
1945	254.6
1946	230.5
1947	240.1
1948	245.6
1949	224.9
1950	274.8
1951	297.9
1952	318.7
1953	330.8
1954	335.6
1955	347.7
1956	369.9
1957	353.9
1958	401.2
1959	415
1960	405.2
1961	400.3
1962	360.9
1963	364.8
1964	376.6
1965	408.7
1966	406
1967	407.6
1968	498
1969	439.8
1970	459.5
1971	475.5
1972	460.3
1973	507.5
1974	533.6
1975	461.8
1976	368.2
1977	384.3
1978	351.7
1979	358
1980	340.9
1981	323.9
1982	296.7
1983	332.2
1984	305.4
1985	294.7
1986	280
1987	277.4
1988	283.3
1989	265.9
1990	247.4
1991	200.4
1992	156.9
1993	164.7
1994	163
1995	176.1
1996	183.6
1997	161.1
1998	166.8
1999	168.7
2000	153.5