Year	Kilotonnes
1850	0.00061
1851	0.00061
1852	0.00122
1853	0.00183
1854	0.00244
1855	0.00305
1856	0.00367
1857	0.00428
1858	0.00489
1859	0.00551
1860	0.00612
1861	0.01217
1862	0.01821
1863	0.02426
1864	0.03031
1865	0.03636
1866	0.04241
1867	0.04846
1868	0.05451
1869	0.06056
1870	0.06661
1871	0.07266
1872	0.07896
1873	0.08526
1874	0.09156
1875	0.09786
1876	0.1042
1877	0.1105
1878	0.1168
1879	0.1231
1880	0.1294
1881	0.1465
1882	0.1366
1883	0.1375
1884	0.1384
1885	0.1523
1886	0.1661
1887	0.18
1888	0.1945
1889	0.2162
1890	0.2286
1891	0.1926
1892	0.2485
1893	0.217
1894	0.2698
1895	0.2382
1896	0.2679
1897	0.3019
1898	0.3121
1899	0.3148
1900	0.3762
1901	0.4097
1902	0.216
1903	0.2365
1904	0.2808
1905	0.305
1906	0.2982
1907	0.3229
1908	0.4234
1909	0.3881
1910	0.4631
1911	0.4024
1912	0.4611
1913	0.5269
1914	0.5696
1915	0.6512
1916	0.7162
1917	0.6151
1918	0.6603
1919	0.7224
1920	0.7581
1921	1.04
1922	1.072
1923	1.313
1924	1.386
1925	1.373
1926	1.349
1927	1.475
1928	1.53
1929	1.721
1930	1.874
1931	1.545
1932	1.288
1933	1.554
1934	1.876
1935	2.01
1936	2.085
1937	2.656
1938	2.553
1939	2.719
1940	2.528
1941	2.607
1942	2.657
1943	2.666
1944	2.59
1945	2.568
1946	2.488
1947	2.629
1948	3.059
1949	3.167
1950	3.31
1951	3.297
1952	3.63
1953	3.797
1954	3.901
1955	4.119
1956	4.544
1957	4.648
1958	4.749
1959	4.947
1960	4.589
1961	4.725
1962	4.865
1963	5.013
1964	5.167
1965	5.327
1966	5.496
1967	5.672
1968	5.855
1969	6.044
1970	6.24
1971	6.444
1972	6.369
1973	6.732
1974	7.083
1975	6.686
1976	6.49
1977	7.072
1978	6.839
1979	7.22
1980	7.734
1981	7.753
1982	7.527
1983	7.095
1984	7.273
1985	7.283
1986	7.368
1987	7.42
1988	7.56
1989	7.582
1990	7.572
1991	7.757
1992	7.947
1993	8.141
1994	5.606
1995	6.018
1996	5.983
1997	7.39
1998	7.552
1999	7.718
2000	7.892