Year	Kilotonnes
1850	0
1851	0.0004
1852	0.0008
1853	0.0012
1854	0.0016
1855	0.002
1856	0.0024
1857	0.0028
1858	0.0032
1859	0.0036
1860	0.004
1861	0.00438
1862	0.00476
1863	0.00513
1864	0.0055
1865	0.00587
1866	0.00623
1867	0.00659
1868	0.00695
1869	0.0073
1870	0.00766
1871	0.0087
1872	0.00976
1873	0.01081
1874	0.01185
1875	0.01433
1876	0.01565
1877	0.01678
1878	0.0186
1879	0.02033
1880	0.02131
1881	0.02215
1882	0.02337
1883	0.0252
1884	0.02801
1885	0.03087
1886	0.0309
1887	0.03374
1888	0.03699
1889	0.04151
1890	0.0445
1891	0.0487
1892	0.05168
1893	0.05032
1894	0.05743
1895	0.06246
1896	0.06609
1897	0.06818
1898	0.07827
1899	0.08335
1900	0.09211
1901	0.1035
1902	0.1127
1903	0.1187
1904	0.1248
1905	0.1329
1906	0.182
1907	0.1946
1908	0.2082
1909	0.2101
1910	0.2179
1911	0.2331
1912	0.2634
1913	0.2982
1914	0.3112
1915	0.3088
1916	0.3538
1917	0.3846
1918	0.3961
1919	0.4421
1920	0.3503
1921	0.3723
1922	0.3846
1923	0.4172
1924	0.4414
1925	0.4471
1926	0.45
1927	0.474
1928	0.4857
1929	0.4985
1930	0.4981
1931	0.4698
1932	0.4551
1933	0.485
1934	0.534
1935	0.5677
1936	0.6037
1937	0.6228
1938	0.6294
1939	0.6804
1940	0.7665
1941	0.8137
1942	0.8135
1943	0.7779
1944	0.7615
1945	0.4731
1946	0.3869
1947	0.4372
1948	0.4575
1949	0.6033
1950	0.6918
1951	0.8159
1952	0.9376
1953	1.012
1954	1.076
1955	1.193
1956	1.318
1957	1.472
1958	0.6524
1959	0.4294
1960	0.395
1961	2.245
1962	6.799
1963	7.563
1964	6.36
1965	6.638
1966	8.717
1967	13.46
1968	21.27
1969	20.82
1970	23.73
1971	31.91
1972	39.43
1973	45.19
1974	55.68
1975	45.38
1976	46.76
1977	61.49
1978	68.99
1979	72.93
1980	71.11
1981	81.04
1982	75.03
1983	66.65
1984	61.67
1985	52.35
1986	52.7
1987	53.8
1988	59.25
1989	61.85
1990	95.4
1991	99.7
1992	102
1993	113.5
1994	117.4
1995	115.2
1996	98.4
1997	104.2
1998	98.86
1999	83.76
2000	81.58