Year	Kilotonnes
1850	0.00064
1851	0.00043
1852	0.00081
1853	0.00073
1854	0.0009
1855	0.00087
1856	0.0012
1857	0.00137
1858	0.00144
1859	0.00136
1860	0.00194
1861	0.00191
1862	0.00214
1863	0.0019
1864	0.00243
1865	0.0024
1866	0.00202
1867	0.00255
1868	0.00247
1869	0.00299
1870	0.00266
1871	0.00242
1872	0.00295
1873	0.00262
1874	0.00295
1875	0.00297
1876	0.0032
1877	0.00281
1878	0.00304
1879	0.00296
1880	0.00268
1881	0.00271
1882	0.00298
1883	0.00222
1884	0.00294
1885	0.00272
1886	0.00254
1887	0.00215
1888	0.00263
1889	0.00211
1890	0.0023
1891	0.00215
1892	0.00245
1893	0.00272
1894	0.00283
1895	0.00286
1896	0.0029
1897	0.00292
1898	0.00353
1899	0.00385
1900	0.0042
1901	0.0055
1902	0.00566
1903	0.00645
1904	0.00677
1905	0.00756
1906	0.00752
1907	0.00816
1908	0.00899
1909	0.00978
1910	0.01
1911	0.01185
1912	0.01179
1913	0.0106
1914	0.0105
1915	0.01296
1916	0.01569
1917	0.01892
1918	0.02106
1919	0.01768
1920	0.01904
1921	0.01578
1922	0.01869
1923	0.02396
1924	0.02385
1925	0.02589
1926	0.02809
1927	0.03086
1928	0.03696
1929	0.03963
1930	0.03456
1931	0.03101
1932	0.0213
1933	0.02568
1934	0.03318
1935	0.03473
1936	0.03545
1937	0.04816
1938	0.04736
1939	0.04671
1940	0.04874
1941	0.05554
1942	0.05166
1943	0.05703
1944	0.05963
1945	0.06275
1946	0.07098
1947	0.06631
1948	0.06885
1949	0.0712
1950	0.09083
1951	0.1082
1952	0.09266
1953	0.1305
1954	0.1259
1955	0.08563
1956	0.1045
1957	0.08568
1958	0.07272
1959	0.09839
1960	0.1109
1961	0.2108
1962	0.1424
1963	0.2244
1964	0.1749
1965	0.2579
1966	0.5143
1967	0.7836
1968	0.7581
1969	0.6523
1970	0.6756
1971	0.7254
1972	0.7291
1973	0.8172
1974	0.806
1975	0.8306
1976	0.7492
1977	0.7973
1978	0.9051
1979	0.9659
1980	1.003
1981	1.162
1982	0.9154
1983	0.759
1984	0.8929
1985	0.8796
1986	1.004
1987	1.079
1988	1.103
1989	1.116
1990	1.167
1991	1.02
1992	0.858
1993	0.7589
1994	0.6759
1995	0.5962
1996	0.5256
1997	0.475
1998	0.4246
1999	0.3775
2000	0.3346