Year	Kilotonnes
1850	0.00032
1851	0.00032
1852	0.00065
1853	0.00097
1854	0.0013
1855	0.00162
1856	0.00195
1857	0.00227
1858	0.0026
1859	0.00293
1860	0.00325
1861	0.00646
1862	0.00967
1863	0.01289
1864	0.0161
1865	0.01931
1866	0.02252
1867	0.02573
1868	0.02895
1869	0.03216
1870	0.03537
1871	0.03859
1872	0.04193
1873	0.04528
1874	0.04863
1875	0.05197
1876	0.05532
1877	0.05867
1878	0.06201
1879	0.06536
1880	0.06871
1881	0.07781
1882	0.07253
1883	0.07301
1884	0.07348
1885	0.08086
1886	0.08823
1887	0.09561
1888	0.1033
1889	0.1148
1890	0.1214
1891	0.1023
1892	0.132
1893	0.1153
1894	0.1433
1895	0.1265
1896	0.1423
1897	0.1603
1898	0.1658
1899	0.1672
1900	0.1998
1901	0.2176
1902	0.1147
1903	0.1256
1904	0.1491
1905	0.162
1906	0.1584
1907	0.1715
1908	0.2249
1909	0.2061
1910	0.2459
1911	0.2137
1912	0.2449
1913	0.2798
1914	0.3025
1915	0.3458
1916	0.3804
1917	0.3267
1918	0.3507
1919	0.3837
1920	0.4026
1921	0.5523
1922	0.5693
1923	0.6975
1924	0.736
1925	0.7294
1926	0.7162
1927	0.7831
1928	0.8126
1929	0.9141
1930	0.9951
1931	0.8202
1932	0.6839
1933	0.8253
1934	0.9961
1935	1.067
1936	1.107
1937	1.411
1938	1.356
1939	1.444
1940	1.342
1941	1.384
1942	1.411
1943	1.416
1944	1.375
1945	1.364
1946	1.321
1947	1.396
1948	1.624
1949	1.682
1950	1.758
1951	1.751
1952	1.928
1953	2.017
1954	2.072
1955	2.187
1956	2.413
1957	2.468
1958	2.522
1959	2.627
1960	2.437
1961	2.458
1962	2.496
1963	2.546
1964	2.603
1965	2.663
1966	2.722
1967	2.778
1968	2.829
1969	2.874
1970	2.912
1971	2.931
1972	2.824
1973	2.914
1974	3
1975	2.779
1976	2.656
1977	2.863
1978	2.745
1979	2.879
1980	3.063
1981	3.054
1982	2.957
1983	2.781
1984	2.839
1985	2.823
1986	2.844
1987	2.859
1988	2.915
1989	2.933
1990	2.946
1991	2.981
1992	3.014
1993	3.045
1994	3.072
1995	3.084
1996	3.104
1997	3.121
1998	3.135
1999	3.145
2000	3.151