Year	Kilotonnes
1850	0.00065
1851	0.00065
1852	0.0013
1853	0.00194
1854	0.00259
1855	0.00324
1856	0.00389
1857	0.00454
1858	0.00519
1859	0.00585
1860	0.0065
1861	0.01292
1862	0.01933
1863	0.02575
1864	0.03217
1865	0.03859
1866	0.04501
1867	0.05143
1868	0.05786
1869	0.06428
1870	0.0707
1871	0.07712
1872	0.08381
1873	0.0905
1874	0.09718
1875	0.1039
1876	0.1106
1877	0.1173
1878	0.1239
1879	0.1306
1880	0.1373
1881	0.1555
1882	0.145
1883	0.1459
1884	0.1469
1885	0.1616
1886	0.1763
1887	0.1911
1888	0.2065
1889	0.2295
1890	0.2426
1891	0.2044
1892	0.2637
1893	0.2304
1894	0.2864
1895	0.2528
1896	0.2843
1897	0.3204
1898	0.3313
1899	0.3342
1900	0.3993
1901	0.4349
1902	0.2292
1903	0.251
1904	0.2981
1905	0.3238
1906	0.3165
1907	0.3428
1908	0.4495
1909	0.412
1910	0.4915
1911	0.4271
1912	0.4894
1913	0.5593
1914	0.6045
1915	0.6912
1916	0.7602
1917	0.6529
1918	0.7008
1919	0.7668
1920	0.8047
1921	1.104
1922	1.138
1923	1.394
1924	1.471
1925	1.458
1926	1.431
1927	1.565
1928	1.624
1929	1.827
1930	1.989
1931	1.639
1932	1.367
1933	1.65
1934	1.991
1935	2.134
1936	2.213
1937	2.819
1938	2.709
1939	2.886
1940	2.683
1941	2.767
1942	2.82
1943	2.829
1944	2.749
1945	2.725
1946	2.64
1947	2.79
1948	3.247
1949	3.361
1950	3.513
1951	3.499
1952	3.853
1953	4.031
1954	4.141
1955	4.372
1956	4.823
1957	4.934
1958	5.041
1959	5.251
1960	4.871
1961	5.111
1962	5.316
1963	5.145
1964	5.857
1965	6.387
1966	6.356
1967	6.181
1968	6.66
1969	6.489
1970	6.83
1971	7.077
1972	6.954
1973	7.077
1974	7.848
1975	7.541
1976	6.641
1977	7.14
1978	7.416
1979	7.328
1980	7.552
1981	7.461
1982	7.652
1983	7.184
1984	7.177
1985	7.067
1986	6.771
1987	6.784
1988	7.018
1989	6.98
1990	6.996
1991	6.949
1992	7.119
1993	7.092
1994	7.278
1995	7.276
1996	5.979
1997	5.658
1998	5.676
1999	6.596
2000	6.605