Year	Kilotonnes
1850	0
1851	0.00004
1852	0.00007
1853	0.00011
1854	0.00014
1855	0.00018
1856	0.00021
1857	0.00025
1858	0.00028
1859	0.00032
1860	0.00035
1861	0.00039
1862	0.00042
1863	0.00045
1864	0.00048
1865	0.00052
1866	0.00055
1867	0.00058
1868	0.00061
1869	0.00064
1870	0.00067
1871	0.00077
1872	0.00086
1873	0.00095
1874	0.00104
1875	0.00126
1876	0.00138
1877	0.00148
1878	0.00164
1879	0.00179
1880	0.00188
1881	0.00195
1882	0.00206
1883	0.00222
1884	0.00247
1885	0.00272
1886	0.00272
1887	0.00297
1888	0.00326
1889	0.00366
1890	0.00392
1891	0.00429
1892	0.00455
1893	0.00443
1894	0.00506
1895	0.0055
1896	0.00582
1897	0.00601
1898	0.0069
1899	0.00734
1900	0.00812
1901	0.00912
1902	0.00993
1903	0.01046
1904	0.011
1905	0.01171
1906	0.01604
1907	0.01715
1908	0.01835
1909	0.01851
1910	0.0192
1911	0.02054
1912	0.02321
1913	0.02627
1914	0.02742
1915	0.02721
1916	0.03117
1917	0.03389
1918	0.0349
1919	0.03895
1920	0.03087
1921	0.03281
1922	0.03389
1923	0.03676
1924	0.0389
1925	0.0394
1926	0.03965
1927	0.04176
1928	0.0428
1929	0.04392
1930	0.04389
1931	0.0414
1932	1.853
1933	2.95
1934	3.912
1935	5.092
1936	4.751
1937	5.931
1938	7.317
1939	8.083
1940	8.994
1941	6.421
1942	4.194
1943	6.284
1944	6.286
1945	4.608
1946	2.904
1947	17.13
1948	26.39
1949	32.48
1950	31.66
1951	30.84
1952	30.02
1953	29.2
1954	28.37
1955	27.55
1956	26.73
1957	25.91
1958	25.09
1959	24.27
1960	23.44
1961	22.62
1962	21.8
1963	20.98
1964	20.16
1965	19.34
1966	18.51
1967	17.69
1968	16.87
1969	16.05
1970	15.23
1971	14.4
1972	13.58
1973	12.76
1974	11.94
1975	11.12
1976	10.3
1977	9.474
1978	8.652
1979	7.831
1980	7.009
1981	6.187
1982	5.365
1983	4.544
1984	3.722
1985	2.9
1986	3.55
1987	2.7
1988	2.7
1989	2.8
1990	3.05
1991	3.05
1992	3.6
1993	4.2
1994	4.3
1995	4.55
1996	4.05
1997	4.4
1998	4.01
1999	3.62
2000	3.23