Year	Kilotonnes
1850	0
1851	0
1852	0.00001
1853	0.00001
1854	0.00001
1855	0.00002
1856	0.00002
1857	0.00003
1858	0.00003
1859	0.00003
1860	0.00004
1861	0.00004
1862	0.00004
1863	0.00005
1864	0.00005
1865	0.00005
1866	0.00006
1867	0.00006
1868	0.00006
1869	0.00007
1870	0.00007
1871	0.00008
1872	0.00009
1873	0.0001
1874	0.00011
1875	0.00013
1876	0.00014
1877	0.00015
1878	0.00017
1879	0.00018
1880	0.00019
1881	0.0002
1882	0.00021
1883	0.00023
1884	0.00025
1885	0.00028
1886	0.00028
1887	0.0003
1888	0.00033
1889	0.00037
1890	0.0004
1891	0.00044
1892	0.00046
1893	0.00045
1894	0.00052
1895	0.00056
1896	0.00059
1897	0.00061
1898	0.0007
1899	0.00075
1900	0.00083
1901	0.00093
1902	0.00101
1903	0.00107
1904	0.00112
1905	0.0012
1906	0.00164
1907	0.00175
1908	0.00187
1909	0.00189
1910	0.00196
1911	0.0021
1912	0.00237
1913	0.00268
1914	0.0028
1915	0.00278
1916	0.00318
1917	0.00346
1918	0.00356
1919	0.00397
1920	0.00315
1921	0.00335
1922	0.00346
1923	0.00375
1924	0.00397
1925	0.00402
1926	0.00404
1927	0.00426
1928	0.00437
1929	0.00448
1930	0.00448
1931	0.00422
1932	0.00409
1933	0.00436
1934	0.0048
1935	0.0051
1936	0.00543
1937	0.0056
1938	0.00566
1939	0.00612
1940	0.00689
1941	0.00731
1942	0.00731
1943	0.00699
1944	0.00685
1945	0.00425
1946	0.00348
1947	0.00393
1948	0.00411
1949	0.00542
1950	0.00622
1951	0.00733
1952	0.00843
1953	0.0091
1954	0.00968
1955	0.01073
1956	0.01185
1957	0.01323
1958	0.01902
1959	0.0235
1960	0.02577
1961	0.02182
1962	0.02046
1963	0.02115
1964	0.02136
1965	0.0225
1966	0.02411
1967	0.02334
1968	0.02529
1969	0.02811
1970	0.03256
1971	0.03304
1972	0.03305
1973	0.03343
1974	0.0332
1975	0.03546
1976	0.03411
1977	0.03786
1978	0.04034
1979	0.04163
1980	0.04435
1981	0.04663
1982	0.04544
1983	0.04152
1984	0.3458
1985	0.65
1986	0.65
1987	0.65
1988	0.65
1989	0.65
1990	0.7
1991	0.7
1992	0.7
1993	0.7
1994	0.75
1995	0.8
1996	0.8
1997	0.85
1998	1.243
1999	1.797
2000	2.67