Year	Kilotonnes
1850	0.00049
1851	0.00049
1852	0.00098
1853	0.00147
1854	0.00197
1855	0.00246
1856	0.00295
1857	0.00345
1858	0.00394
1859	0.00444
1860	0.00493
1861	0.0098
1862	0.01467
1863	0.01954
1864	0.02441
1865	0.02929
1866	0.03416
1867	0.03903
1868	0.0439
1869	0.04878
1870	0.05365
1871	0.05853
1872	0.0636
1873	0.06867
1874	0.07375
1875	0.07883
1876	0.0839
1877	0.08898
1878	0.09406
1879	0.09913
1880	0.1042
1881	0.118
1882	0.11
1883	0.1107
1884	0.1115
1885	0.1226
1886	0.1338
1887	0.145
1888	0.1567
1889	0.1742
1890	0.1841
1891	0.1551
1892	0.2001
1893	0.1748
1894	0.2173
1895	0.1918
1896	0.2158
1897	0.2431
1898	0.2514
1899	0.2536
1900	0.303
1901	0.33
1902	0.174
1903	0.1905
1904	0.2262
1905	0.2457
1906	0.2402
1907	0.2601
1908	0.3411
1909	0.3126
1910	0.373
1911	0.3241
1912	0.3714
1913	0.4244
1914	0.4588
1915	0.5245
1916	0.5769
1917	0.4955
1918	0.5318
1919	0.5819
1920	0.6106
1921	0.8377
1922	0.8635
1923	1.058
1924	1.116
1925	1.106
1926	1.086
1927	1.188
1928	1.232
1929	1.386
1930	1.509
1931	1.244
1932	1.037
1933	1.252
1934	1.511
1935	1.619
1936	1.679
1937	2.139
1938	2.056
1939	2.19
1940	2.036
1941	2.1
1942	2.14
1943	2.147
1944	2.086
1945	2.068
1946	2.004
1947	2.117
1948	2.464
1949	2.551
1950	2.666
1951	7.76
1952	6.933
1953	4.327
1954	4.662
1955	5.586
1956	4.333
1957	5.609
1958	5.052
1959	3.604
1960	1.698
1961	2.384
1962	1.292
1963	7.17
1964	20.94
1965	18.62
1966	16.68
1967	16.91
1968	16.73
1969	15.78
1970	18.44
1971	17.87
1972	19.17
1973	19.94
1974	22.28
1975	24.41
1976	20.94
1977	24.17
1978	20.42
1979	19.15
1980	19.85
1981	18.32
1982	14.84
1983	8.961
1984	12.9
1985	17.17
1986	16.72
1987	16.8
1988	15.23
1989	16.74
1990	14.87
1991	16.27
1992	15.92
1993	15.36
1994	17.35
1995	16.18
1996	16.34
1997	10.83
1998	14.95
1999	17.93
2000	16.73