Year	Kilotonnes
1850	0
1851	0.00004
1852	0.00008
1853	0.00012
1854	0.00016
1855	0.0002
1856	0.00024
1857	0.00029
1858	0.00033
1859	0.00037
1860	0.00041
1861	0.00045
1862	0.00048
1863	0.00052
1864	0.00056
1865	0.0006
1866	0.00063
1867	0.00067
1868	0.00071
1869	0.00074
1870	0.00078
1871	0.00089
1872	0.00099
1873	0.0011
1874	0.00121
1875	0.00146
1876	0.00159
1877	0.00171
1878	0.00189
1879	0.00207
1880	0.00217
1881	0.00434
1882	0.00652
1883	0.00869
1884	0.01087
1885	0.01305
1886	0.01523
1887	0.01741
1888	0.01959
1889	0.02178
1890	0.02396
1891	0.03196
1892	0.2838
1893	0.4797
1894	0.6304
1895	0.9448
1896	1.071
1897	1.551
1898	1.704
1899	1.378
1900	1.607
1901	2.236
1902	1.628
1903	2.878
1904	3.219
1905	3.988
1906	4.378
1907	5.131
1908	5.344
1909	5.875
1910	6.07
1911	6.69
1912	6.328
1913	6.181
1914	6.497
1915	6.608
1916	7.442
1917	7.785
1918	7.963
1919	9.342
1920	10.46
1921	10.91
1922	10.28
1923	11.91
1924	13.41
1925	13.49
1926	17.5
1927	19.4
1928	21.19
1929	23.67
1930	24.13
1931	18.92
1932	18.02
1933	19.22
1934	20.41
1935	20.8
1936	21.08
1937	24.11
1938	34.64
1939	39.48
1940	42.47
1941	41.68
1942	31.7
1943	39.28
1944	27.89
1945	20.28
1946	16.85
1947	18.01
1948	25.99
1949	29.11
1950	64.42
1951	46.44
1952	72.96
1953	78.96
1954	73.08
1955	80.5
1956	76.01
1957	80.31
1958	58.84
1959	51.61
1960	45.79
1961	46.99
1962	35.76
1963	33.49
1964	16.34
1965	19.58
1966	18.87
1967	19.85
1968	22.53
1969	22.23
1970	33.86
1971	54.61
1972	76.84
1973	95.64
1974	108.4
1975	103.1
1976	103.5
1977	122.1
1978	120.9
1979	141.6
1980	177.1
1981	164.3
1982	158.2
1983	157.4
1984	185.2
1985	193.6
1986	199.1
1987	215.7
1988	224
1989	235.6
1990	280.9
1991	310.5
1992	316.1
1993	343.9
1994	323.9
1995	341.8
1996	366.6
1997	495.2
1998	457.4
1999	426.5
2000	417.9