Year	Kilotonnes
1850	0.00054
1851	0.00054
1852	0.00108
1853	0.00162
1854	0.00216
1855	0.0027
1856	0.00324
1857	0.00378
1858	0.00432
1859	0.00486
1860	0.0054
1861	0.01074
1862	0.01608
1863	0.02142
1864	0.02676
1865	0.0321
1866	0.03744
1867	0.04278
1868	0.04812
1869	0.05346
1870	0.05881
1871	0.06415
1872	0.06971
1873	0.07527
1874	0.08084
1875	0.0864
1876	0.09196
1877	0.09753
1878	0.1031
1879	0.1087
1880	0.1142
1881	0.1293
1882	0.1206
1883	0.1214
1884	0.1222
1885	0.1344
1886	0.1467
1887	0.1589
1888	0.1717
1889	0.1909
1890	0.2018
1891	0.17
1892	0.2194
1893	0.1916
1894	0.2382
1895	0.2103
1896	0.2365
1897	0.2665
1898	0.2756
1899	0.278
1900	0.3321
1901	0.3617
1902	0.1907
1903	0.2088
1904	0.2479
1905	0.2693
1906	0.2633
1907	0.2851
1908	0.3739
1909	0.3427
1910	0.4089
1911	0.3553
1912	0.4071
1913	0.4652
1914	0.5028
1915	0.5749
1916	0.6323
1917	0.5431
1918	0.5829
1919	0.6378
1920	0.6693
1921	0.9182
1922	0.9465
1923	1.16
1924	1.224
1925	1.212
1926	1.191
1927	1.302
1928	1.351
1929	1.52
1930	1.654
1931	1.364
1932	1.137
1933	1.372
1934	1.656
1935	1.775
1936	1.841
1937	2.345
1938	2.254
1939	2.4
1940	2.232
1941	2.301
1942	2.346
1943	2.353
1944	2.286
1945	2.267
1946	2.196
1947	2.321
1948	2.701
1949	2.796
1950	2.922
1951	2.911
1952	3.205
1953	3.353
1954	3.444
1955	3.636
1956	4.012
1957	4.104
1958	4.193
1959	4.368
1960	4.052
1961	4.251
1962	4.422
1963	4.279
1964	4.872
1965	5.313
1966	5.287
1967	5.141
1968	5.539
1969	5.398
1970	5.681
1971	5.887
1972	5.989
1973	6.492
1974	6.91
1975	6.253
1976	6.129
1977	6.593
1978	6.561
1979	23.4
1980	19.11
1981	15.48
1982	11.86
1983	13.81
1984	9.818
1985	11.55
1986	12.59
1987	13.37
1988	13.17
1989	12.11
1990	11.56
1991	11.57
1992	11.58
1993	11.59
1994	11.6
1995	11.61
1996	11.62
1997	11.63
1998	11.63
1999	11.64
2000	11.65