Year	Kilotonnes
1850	0
1851	0.00026
1852	0.00051
1853	0.00077
1854	0.00102
1855	0.00128
1856	0.00153
1857	0.00179
1858	0.00205
1859	0.0023
1860	0.00256
1861	0.0028
1862	0.00304
1863	0.00328
1864	0.00352
1865	0.00375
1866	0.00399
1867	0.00422
1868	0.00445
1869	0.00467
1870	0.0049
1871	0.00557
1872	0.00624
1873	0.00691
1874	0.00758
1875	0.00917
1876	0.01001
1877	0.01073
1878	0.0119
1879	0.013
1880	0.01363
1881	0.01417
1882	0.01495
1883	0.01612
1884	0.01791
1885	0.01974
1886	0.01976
1887	0.02158
1888	0.02366
1889	0.02655
1890	0.02846
1891	0.03115
1892	0.03306
1893	0.03219
1894	0.03674
1895	0.03995
1896	0.04227
1897	0.04361
1898	0.05006
1899	0.05331
1900	0.05892
1901	0.06623
1902	0.07211
1903	0.07592
1904	0.07983
1905	0.08502
1906	0.1164
1907	0.1245
1908	0.1332
1909	0.1344
1910	0.1394
1911	0.1491
1912	0.1685
1913	0.1907
1914	0.1991
1915	0.1975
1916	0.2263
1917	0.246
1918	0.2534
1919	0.2828
1920	0.2241
1921	0.2381
1922	0.246
1923	0.2668
1924	0.2823
1925	0.286
1926	0.2878
1927	0.3031
1928	0.3106
1929	0.3188
1930	0.3186
1931	0.3005
1932	0.2911
1933	0.3102
1934	0.3416
1935	0.3631
1936	0.3861
1937	0.3984
1938	0.4026
1939	0.4352
1940	0.4903
1941	0.5205
1942	0.5203
1943	0.4976
1944	0.487
1945	0.3026
1946	0.2475
1947	0.2797
1948	0.2926
1949	0.3859
1950	0.6177
1951	0.7724
1952	0.9272
1953	1.082
1954	1.237
1955	1.779
1956	1.78
1957	2.245
1958	2.633
1959	3.176
1960	3.719
1961	5.116
1962	8.684
1963	7.679
1964	8.768
1965	11.18
1966	12.58
1967	11.73
1968	9.713
1969	10.65
1970	12.75
1971	10.5
1972	5.73
1973	9.108
1974	8.955
1975	11.68
1976	12.47
1977	13.25
1978	16.92
1979	10.3
1980	9.286
1981	9.758
1982	11.32
1983	11.33
1984	11.57
1985	11.8
1986	60.76
1987	60.91
1988	58.25
1989	58.4
1990	57.85
1991	59.38
1992	60.95
1993	62.56
1994	64.21
1995	65.91
1996	67.65
1997	69.43
1998	71.27
1999	73.15
2000	75.08