Year	Kilotonnes
1850	0.00024
1851	0.00024
1852	0.00049
1853	0.00073
1854	0.00098
1855	0.00122
1856	0.00147
1857	0.00171
1858	0.00196
1859	0.00221
1860	0.00245
1861	0.00488
1862	0.0073
1863	0.00972
1864	0.01215
1865	0.01457
1866	0.01699
1867	0.01942
1868	0.02184
1869	0.02427
1870	0.02669
1871	0.02912
1872	0.03164
1873	0.03416
1874	0.03669
1875	0.03921
1876	0.04174
1877	0.04427
1878	0.04679
1879	0.04932
1880	0.05184
1881	0.05871
1882	0.05473
1883	0.05509
1884	0.05545
1885	0.06101
1886	0.06657
1887	0.07214
1888	0.07795
1889	0.08665
1890	0.0916
1891	0.07717
1892	0.09956
1893	0.08697
1894	0.1081
1895	0.09544
1896	0.1073
1897	0.121
1898	0.1251
1899	0.1262
1900	0.1507
1901	0.1642
1902	0.08654
1903	0.09475
1904	0.1125
1905	0.1222
1906	0.1195
1907	0.1294
1908	0.1697
1909	0.1555
1910	0.1856
1911	0.1613
1912	0.1848
1913	0.2111
1914	0.2282
1915	0.261
1916	0.287
1917	0.2465
1918	0.2646
1919	0.2895
1920	0.3038
1921	0.4168
1922	0.4296
1923	0.5263
1924	0.5554
1925	0.5503
1926	0.5404
1927	0.5909
1928	0.6131
1929	0.6897
1930	0.7509
1931	0.6189
1932	0.516
1933	0.6227
1934	0.7516
1935	0.8054
1936	0.8354
1937	1.064
1938	1.023
1939	1.09
1940	1.013
1941	1.045
1942	1.065
1943	1.068
1944	1.038
1945	1.029
1946	0.9968
1947	1.053
1948	1.226
1949	1.269
1950	1.326
1951	0.5223
1952	1.495
1953	1.13
1954	0.5361
1955	1.103
1956	0.9259
1957	1.029
1958	1.147
1959	0.5648
1960	0.3851
1961	0.3804
1962	0.5586
1963	0.1818
1964	0.1617
1965	0.1416
1966	1.377
1967	2.612
1968	3.847
1969	5.083
1970	5.203
1971	4.576
1972	4.705
1973	4.633
1974	5.075
1975	4.997
1976	5.536
1977	5.573
1978	5.754
1979	5.967
1980	6.336
1981	6.522
1982	6.84
1983	6.713
1984	6.999
1985	6.477
1986	7.017
1987	7.264
1988	6.576
1989	6.558
1990	7.425
1991	8.262
1992	7.744
1993	8.24
1994	9.122
1995	8.041
1996	8.385
1997	6.042
1998	5.924
1999	5.107
2000	5.378