Year	Kilotonnes
1850	0.00012
1851	0.00015
1852	0.00017
1853	0.00019
1854	0.00023
1855	0.00025
1856	0.00027
1857	0.00028
1858	0.00029
1859	0.00032
1860	0.00034
1861	0.00033
1862	0.00034
1863	0.00039
1864	0.00042
1865	0.00043
1866	0.0005
1867	0.00051
1868	0.00057
1869	0.00064
1870	0.00068
1871	0.00071
1872	0.00086
1873	0.00093
1874	0.00091
1875	0.00093
1876	0.00091
1877	0.001
1878	0.00098
1879	0.00117
1880	0.00131
1881	0.00139
1882	0.00156
1883	0.00171
1884	0.00181
1885	0.00184
1886	0.0019
1887	0.00216
1888	0.00248
1889	0.00236
1890	0.00263
1891	0.00282
1892	0.003
1893	0.00303
1894	0.00287
1895	0.0032
1896	0.00325
1897	0.00339
1898	0.00369
1899	0.00422
1900	0.00448
1901	0.00487
1902	0.00507
1903	0.00594
1904	0.00595
1905	0.00664
1906	0.00698
1907	0.00792
1908	0.00713
1909	0.00786
1910	0.00851
1911	0.00852
1912	0.00922
1913	0.00989
1914	0.00893
1915	0.00936
1916	0.0107
1917	0.01165
1918	0.01218
1919	0.00987
1920	0.01141
1921	0.00897
1922	0.00892
1923	0.01199
1924	0.01067
1925	0.01085
1926	0.01165
1927	0.0116
1928	0.0112
1929	0.01199
1930	0.01063
1931	0.00877
1932	0.00717
1933	0.00765
1934	0.00843
1935	0.00872
1936	0.0101
1937	0.01068
1938	0.00884
1939	0.00997
1940	0.01123
1941	0.01276
1942	0.01361
1943	0.01471
1944	0.01478
1945	0.01406
1946	0.01277
1947	0.01437
1948	0.01358
1949	0.01177
1950	0.01257
1951	0.01414
1952	0.04147
1953	0.02597
1954	0.0127
1955	0.01349
1956	0.02925
1957	0.01501
1958	0.01403
1959	0.01464
1960	0.01526
1961	0.01588
1962	0.01649
1963	0.01711
1964	0.01773
1965	0.01834
1966	0.01896
1967	0.01958
1968	0.02019
1969	0.02081
1970	0.02143
1971	0.02205
1972	0.02266
1973	0.02328
1974	0.0239
1975	0.02451
1976	0.06057
1977	0.09664
1978	0.1327
1979	0.1688
1980	0.2048
1981	0.2409
1982	0.2769
1983	0.313
1984	0.3491
1985	0.3851
1986	0.4212
1987	0.4573
1988	0.4933
1989	0.5294
1990	0.5654
1991	0.4997
1992	0.4416
1993	0.3902
1994	0.3448
1995	0.3047
1996	0.2693
1997	0.238
1998	0.2103
1999	0.1858
2000	0.1642