Year	Kilotonnes
1850	0
1851	0.0002
1852	0.00039
1853	0.00059
1854	0.00079
1855	0.00099
1856	0.00118
1857	0.00138
1858	0.00158
1859	0.00178
1860	0.00197
1861	0.00216
1862	0.00235
1863	0.00253
1864	0.00271
1865	0.0029
1866	0.00308
1867	0.00325
1868	0.00343
1869	0.0036
1870	0.00378
1871	0.00429
1872	0.00481
1873	0.00533
1874	0.00585
1875	0.00707
1876	0.00772
1877	0.00828
1878	0.00918
1879	0.01003
1880	0.01051
1881	0.01092
1882	0.01153
1883	0.01243
1884	0.01381
1885	0.01523
1886	0.01524
1887	0.01664
1888	0.01824
1889	0.02048
1890	0.02195
1891	0.02402
1892	0.02549
1893	0.02482
1894	0.02833
1895	0.03081
1896	0.0326
1897	0.03363
1898	0.03861
1899	0.04111
1900	0.04544
1901	0.05107
1902	0.05561
1903	0.05855
1904	0.06157
1905	0.06557
1906	0.2132
1907	0.3609
1908	0.5087
1909	0.6566
1910	0.8102
1911	0.9638
1912	1.205
1913	1.403
1914	2.006
1915	2.512
1916	2.096
1917	2.08
1918	2.064
1919	2.449
1920	3.175
1921	3.418
1922	3.486
1923	4.18
1924	4.39
1925	6.969
1926	8.656
1927	8.913
1928	9.776
1929	10.94
1930	10.42
1931	11.13
1932	13.02
1933	15.66
1934	20.27
1935	22.96
1936	26.57
1937	28.56
1938	39.15
1939	49.58
1940	67.1
1941	69.93
1942	77.78
1943	76.4
1944	80.66
1945	0.8517
1946	1.628
1947	3.749
1948	6.193
1949	8.638
1950	7.987
1951	15.13
1952	17.6
1953	55.95
1954	59.66
1955	66.31
1956	70.04
1957	69.43
1958	66.13
1959	66.29
1960	66.4
1961	88.92
1962	97.55
1963	107.5
1964	111.4
1965	100.1
1966	117.4
1967	131.3
1968	133.3
1969	151.8
1970	183.2
1971	197.4
1972	198.8
1973	227
1974	264
1975	282.7
1976	291.7
1977	337.9
1978	359.7
1979	433.3
1980	481.4
1981	555.5
1982	519.6
1983	484.5
1984	530.9
1985	640.4
1986	632.9
1987	602.1
1988	709
1989	756.4
1990	853.2
1991	737.9
1992	671
1993	660.5
1994	626.6
1995	609.5
1996	602
1997	640.1
1998	524.2
1999	458.1
2000	413.9