Year	Kilotonnes
1850	0
1851	0.00002
1852	0.00005
1853	0.00007
1854	0.0001
1855	0.00012
1856	0.00014
1857	0.00017
1858	0.00019
1859	0.00021
1860	0.00024
1861	0.00026
1862	0.00029
1863	0.00031
1864	0.00033
1865	0.00036
1866	0.00038
1867	0.00041
1868	0.00043
1869	0.00045
1870	0.00048
1871	0.0005
1872	0.00053
1873	0.00055
1874	0.00057
1875	0.0006
1876	0.00062
1877	0.00065
1878	0.00067
1879	0.0007
1880	0.00072
1881	0.00111
1882	0.0015
1883	0.00189
1884	0.00228
1885	0.00267
1886	0.00306
1887	0.00346
1888	0.00385
1889	0.00424
1890	0.00464
1891	0.00485
1892	0.00501
1893	0.00511
1894	0.00514
1895	0.0051
1896	0.00727
1897	0.00943
1898	0.01157
1899	0.0139
1900	0.01616
1901	0.01938
1902	0.03021
1903	0.04257
1904	0.07274
1905	0.06628
1906	0.07684
1907	0.09142
1908	0.102
1909	0.1085
1910	0.1122
1911	0.12
1912	0.1509
1913	0.1719
1914	0.1348
1915	0.1007
1916	0.1681
1917	0.1573
1918	0.142
1919	0.108
1920	0.2161
1921	0.3241
1922	0.4322
1923	0.5402
1924	0.6483
1925	0.7563
1926	0.8644
1927	0.9724
1928	2.031
1929	2.615
1930	2.615
1931	2.593
1932	2.636
1933	2.485
1934	22.26
1935	79.18
1936	86.68
1937	91.95
1938	92.88
1939	85.64
1940	54.33
1941	33.81
1942	56
1943	78.98
1944	88.76
1945	98.17
1946	97.86
1947	97.38
1948	70.29
1949	80.96
1950	8.703
1951	12.1
1952	11.22
1953	13.83
1954	16.84
1955	18.18
1956	29.27
1957	25.6
1958	28.2
1959	29.02
1960	29.22
1961	29.27
1962	28.87
1963	29.81
1964	27.08
1965	29.82
1966	52.83
1967	26.05
1968	35.74
1969	36.89
1970	32.22
1971	35.21
1972	34.41
1973	41.69
1974	59.2
1975	91.88
1976	78.8
1977	90.25
1978	84.87
1979	96.26
1980	98.02
1981	99.46
1982	91.12
1983	153.6
1984	144.4
1985	128
1986	129
1987	160.3
1988	231.1
1989	213.8
1990	181.7
1991	184.8
1992	187.9
1993	191.1
1994	194.4
1995	197.7
1996	201
1997	204.4
1998	207.9
1999	211.4
2000	215