Year	Kilotonnes
1850	0
1851	0.01554
1852	0.03107
1853	0.04661
1854	0.06215
1855	0.07768
1856	0.09322
1857	0.1088
1858	0.1243
1859	0.1398
1860	0.1554
1861	0.1701
1862	0.1847
1863	0.1992
1864	0.2135
1865	0.2277
1866	0.2417
1867	0.2556
1868	0.2694
1869	0.283
1870	0.2965
1871	0.3441
1872	0.3916
1873	0.4391
1874	0.4864
1875	0.5336
1876	0.5807
1877	0.6277
1878	0.6745
1879	0.7213
1880	0.77
1881	0.8096
1882	0.8486
1883	0.887
1884	0.9249
1885	0.9622
1886	0.9989
1887	1.035
1888	1.071
1889	1.106
1890	1.141
1891	1.191
1892	1.257
1893	1.263
1894	1.345
1895	1.57
1896	1.671
1897	1.732
1898	1.9
1899	2.052
1900	2.392
1901	2.548
1902	2.807
1903	2.822
1904	3.081
1905	3.155
1906	3.598
1907	4.043
1908	4.573
1909	4.298
1910	4.399
1911	4.663
1912	5.639
1913	6.083
1914	6.123
1915	6.292
1916	6.301
1917	6.567
1918	7.334
1919	9.496
1920	6.369
1921	6.811
1922	6.723
1923	6.937
1924	7.434
1925	7.432
1926	7.586
1927	8.122
1928	8.252
1929	8.39
1930	8.63
1931	7.816
1932	7.285
1933	7.259
1934	8.031
1935	8.43
1936	8.226
1937	8.94
1938	9.943
1939	9.796
1940	10.29
1941	10.24
1942	10.2
1943	8.89
1944	9.056
1945	10.01
1946	10.22
1947	10.31
1948	0.37
1949	22.46
1950	61.78
1951	80.85
1952	85.11
1953	79.22
1954	73.73
1955	71.97
1956	92.24
1957	81.18
1958	87.41
1959	82.52
1960	102
1961	104.7
1962	118.5
1963	159.4
1964	156.9
1965	157.4
1966	145.5
1967	152.3
1968	164.3
1969	170.1
1970	159.5
1971	143.4
1972	140.5
1973	129.1
1974	140.7
1975	140.5
1976	119.2
1977	135.1
1978	143.2
1979	156.4
1980	183
1981	188.4
1982	207.1
1983	185.6
1984	206.3
1985	236.9
1986	249.7
1987	261.1
1988	291.1
1989	296.5
1990	342.4
1991	343.2
1992	377.9
1993	400.6
1994	446.6
1995	454.1
1996	513.9
1997	505.7
1998	556.5
1999	605.2
2000	704.9