Year	Kilotonnes
1850	0
1851	0.00001
1852	0.00002
1853	0.00003
1854	0.00005
1855	0.00006
1856	0.00007
1857	0.00008
1858	0.00009
1859	0.0001
1860	0.00012
1861	0.00013
1862	0.00014
1863	0.00015
1864	0.00016
1865	0.00017
1866	0.00019
1867	0.0002
1868	0.00021
1869	0.00022
1870	0.00023
1871	0.00024
1872	0.00026
1873	0.00027
1874	0.00028
1875	0.00029
1876	0.0003
1877	0.00031
1878	0.00033
1879	0.00034
1880	0.00035
1881	0.00054
1882	0.00073
1883	0.00092
1884	0.00111
1885	0.0013
1886	0.00149
1887	0.00168
1888	0.00187
1889	0.00206
1890	0.00225
1891	0.00236
1892	0.00244
1893	0.00249
1894	0.0025
1895	0.00248
1896	0.00354
1897	0.00459
1898	0.00563
1899	0.00676
1900	0.00785
1901	0.00942
1902	0.01884
1903	0.02827
1904	0.03769
1905	0.04711
1906	0.05653
1907	0.06595
1908	0.07538
1909	0.0848
1910	0.09422
1911	0.8794
1912	0.4083
1913	3.141
1914	0.9422
1915	1.822
1916	4.303
1917	8.857
1918	10.68
1919	7.035
1920	4.648
1921	5.747
1922	5.433
1923	4.805
1924	5.119
1925	5.653
1926	5.433
1927	5.81
1928	8.417
1929	8.543
1930	8.951
1931	9.077
1932	8.511
1933	7.475
1934	6.941
1935	5.716
1936	5.747
1937	5.371
1938	7.098
1939	20.92
1940	29.18
1941	38.31
1942	37.05
1943	44.39
1944	46.58
1945	46.15
1946	43.03
1947	44.58
1948	62.36
1949	73.81
1950	77.95
1951	79.93
1952	76.32
1953	72.91
1954	73.64
1955	67.33
1956	59.38
1957	69.02
1958	70.48
1959	66.83
1960	78.74
1961	76.04
1962	81.31
1963	93.01
1964	116.9
1965	127.2
1966	117
1967	103.1
1968	102.7
1969	57.93
1970	52.02
1971	70.71
1972	87.73
1973	86.91
1974	107.3
1975	145.6
1976	158.7
1977	202.7
1978	202.4
1979	209.4
1980	244.3
1981	267.6
1982	277.3
1983	247.9
1984	272.6
1985	279.6
1986	283.4
1987	312.6
1988	307.9
1989	298.9
1990	301.7
1991	297.6
1992	280.9
1993	295.2
1994	284.2
1995	271.7
1996	271.4
1997	260.1
1998	253.4
1999	242
2000	227.6