Year	Kilotonnes
1850	0.00159
1851	0.00159
1852	0.00319
1853	0.00479
1854	0.00638
1855	0.00798
1856	0.00958
1857	0.01118
1858	0.01278
1859	0.01439
1860	0.01599
1861	0.03179
1862	0.04759
1863	0.06339
1864	0.07919
1865	0.09499
1866	0.1108
1867	0.1266
1868	0.1424
1869	0.1582
1870	0.174
1871	0.1898
1872	0.2063
1873	0.2227
1874	0.2392
1875	0.2557
1876	0.2721
1877	0.2886
1878	0.3051
1879	0.3215
1880	0.338
1881	0.3828
1882	0.3568
1883	0.3591
1884	0.3615
1885	0.3978
1886	0.434
1887	0.4703
1888	0.5082
1889	0.5649
1890	0.5972
1891	0.5031
1892	0.6491
1893	0.567
1894	0.7048
1895	0.6223
1896	0.6998
1897	0.7886
1898	0.8154
1899	0.8225
1900	0.9828
1901	1.07
1902	0.5642
1903	0.6178
1904	0.7337
1905	0.7969
1906	0.779
1907	0.8437
1908	1.106
1909	1.014
1910	1.21
1911	1.051
1912	1.205
1913	1.377
1914	1.488
1915	1.701
1916	1.871
1917	1.607
1918	1.725
1919	1.887
1920	1.981
1921	2.717
1922	2.801
1923	3.431
1924	3.621
1925	3.588
1926	3.523
1927	3.853
1928	3.997
1929	4.497
1930	4.895
1931	4.035
1932	3.364
1933	4.06
1934	4.9
1935	5.251
1936	5.446
1937	6.939
1938	6.669
1939	7.103
1940	6.604
1941	6.81
1942	6.942
1943	6.964
1944	6.765
1945	6.708
1946	6.499
1947	6.868
1948	7.991
1949	8.273
1950	8.646
1951	8.613
1952	9.483
1953	9.921
1954	10.19
1955	10.76
1956	11.87
1957	12.14
1958	12.41
1959	12.93
1960	11.99
1961	12.58
1962	13.08
1963	12.66
1964	14.42
1965	15.72
1966	15.65
1967	15.21
1968	16.39
1969	15.97
1970	16.81
1971	17.42
1972	17.72
1973	19.21
1974	20.45
1975	18.5
1976	18.14
1977	19.51
1978	19.41
1979	20.23
1980	21.08
1981	21.53
1982	21.01
1983	20.71
1984	20.89
1985	20.97
1986	20.97
1987	21.46
1988	21.36
1989	21.46
1990	20.84
1991	20.92
1992	20.99
1993	21.07
1994	21.15
1995	21.23
1996	21.3
1997	21.38
1998	21.46
1999	21.54
2000	21.62