Year	Kilotonnes
1850	0
1851	0.00004
1852	0.00008
1853	0.00011
1854	0.00015
1855	0.00019
1856	0.00023
1857	0.00026
1858	0.0003
1859	0.00034
1860	0.00038
1861	0.00041
1862	0.00045
1863	0.00048
1864	0.00052
1865	0.00055
1866	0.00059
1867	0.00062
1868	0.00066
1869	0.00069
1870	0.00072
1871	0.00082
1872	0.00092
1873	0.00102
1874	0.00112
1875	0.00135
1876	0.00147
1877	0.00158
1878	0.00175
1879	0.00192
1880	0.00201
1881	0.00209
1882	0.0022
1883	0.00237
1884	0.00264
1885	0.00291
1886	0.00291
1887	0.00318
1888	0.00349
1889	0.00391
1890	0.00419
1891	0.00459
1892	0.00487
1893	0.00474
1894	0.00541
1895	0.00589
1896	0.00623
1897	0.00643
1898	0.00738
1899	0.00786
1900	0.00868
1901	0.00976
1902	0.01063
1903	0.01119
1904	0.01176
1905	0.01253
1906	0.01716
1907	0.01835
1908	0.01963
1909	0.0198
1910	0.02054
1911	0.02198
1912	0.04401
1913	0.06609
1914	0.08823
1915	0.1104
1916	0.1327
1917	0.155
1918	0.1773
1919	0.1997
1920	0.2222
1921	0.2447
1922	0.2673
1923	0.2899
1924	0.3126
1925	0.3353
1926	0.3581
1927	0.381
1928	0.4039
1929	0.4268
1930	0.4498
1931	0.4729
1932	0.496
1933	0.5192
1934	0.5424
1935	0.5657
1936	0.589
1937	0.6124
1938	0.6358
1939	0.6593
1940	0.6829
1941	0.7065
1942	0.7301
1943	0.7538
1944	0.7776
1945	0.8014
1946	0.8253
1947	0.8492
1948	0.8732
1949	0.8972
1950	0.4673
1951	0.5521
1952	0.6666
1953	2.073
1954	3.133
1955	2.933
1956	3.362
1957	3.737
1958	3.728
1959	3.787
1960	3.775
1961	3.534
1962	4.175
1963	4.927
1964	13.02
1965	20.05
1966	32.55
1967	36.77
1968	47.73
1969	37.7
1970	52.91
1971	69.45
1972	76.61
1973	88.01
1974	87.07
1975	93.1
1976	92.11
1977	105.6
1978	106
1979	133.2
1980	144.4
1981	145.6
1982	139.5
1983	136.3
1984	142.2
1985	226.8
1986	235.2
1987	267.2
1988	294.8
1989	354.4
1990	482.1
1991	552.1
1992	599.7
1993	578.6
1994	558.1
1995	624.7
1996	669.1
1997	661.2
1998	528.4
1999	507.5
2000	466.5