Year	Kilotonnes
1850	0.03966
1851	0.03181
1852	0.03981
1853	0.01609
1854	0.00823
1855	0.00831
1856	0.03218
1857	0.03226
1858	0.03233
1859	0.03241
1860	0.04042
1861	0.04049
1862	0.04849
1863	0.0565
1864	0.07243
1865	0.06457
1866	0.0964
1867	0.1282
1868	0.1362
1869	0.1363
1870	0.07298
1871	0.08897
1872	0.09704
1873	0.09717
1874	0.08937
1875	0.0895
1876	0.08949
1877	0.09741
1878	0.0736
1879	0.07791
1880	0.08223
1881	0.1469
1882	0.1654
1883	0.1955
1884	0.2341
1885	0.2133
1886	0.1937
1887	0.1878
1888	0.2164
1889	0.2454
1890	0.2482
1891	0.295
1892	0.272
1893	0.2924
1894	0.3132
1895	0.3344
1896	0.3673
1897	0.4254
1898	0.474
1899	0.5449
1900	0.5739
1901	0.614
1902	0.5881
1903	0.6191
1904	0.6631
1905	0.7369
1906	0.7763
1907	0.9134
1908	0.921
1909	0.8682
1910	1.009
1911	1.055
1912	1.124
1913	1.124
1914	1.035
1915	0.9226
1916	0.8678
1917	0.8579
1918	0.8809
1919	0.6083
1920	0.7388
1921	0.6923
1922	0.7495
1923	0.8412
1924	0.8399
1925	0.8428
1926	0.8286
1927	0.8921
1928	0.8587
1929	0.8472
1930	0.8203
1931	0.7051
1932	0.7665
1933	0.7785
1934	0.8031
1935	0.8527
1936	0.9237
1937	1.021
1938	1.054
1939	1.113
1940	1.109
1941	1.19
1942	1.188
1943	1.14
1944	1.142
1945	1.071
1946	1.094
1947	1.112
1948	1.149
1949	1.167
1950	1.261
1951	2.695
1952	3.188
1953	2.474
1954	2.676
1955	2.435
1956	2.347
1957	0.9033
1958	0.422
1959	1.342
1960	0.9318
1961	0.263
1962	0.9292
1963	0.9679
1964	0.5438
1965	0.4038
1966	0.2651
1967	0.784
1968	0.2567
1969	0.1293
1970	0.1905
1971	0.2517
1972	0.4488
1973	0.646
1974	0.8431
1975	2.09
1976	1.085
1977	2.219
1978	2.756
1979	2.744
1980	2.671
1981	2.407
1982	2.996
1983	2.143
1984	2.542
1985	1.836
1986	1.683
1987	1.754
1988	1.903
1989	1.471
1990	1.58
1991	1.468
1992	1.528
1993	1.535
1994	1.579
1995	1.544
1996	1.524
1997	1.473
1998	1.464
1999	1.542
2000	1.374