Year	Kilotonnes
1850	0
1851	0.00003
1852	0.00006
1853	0.00009
1854	0.00012
1855	0.00015
1856	0.00018
1857	0.00021
1858	0.00024
1859	0.00027
1860	0.0003
1861	0.00033
1862	0.00036
1863	0.00039
1864	0.00041
1865	0.00044
1866	0.00047
1867	0.0005
1868	0.00052
1869	0.00055
1870	0.00057
1871	0.00065
1872	0.00073
1873	0.00081
1874	0.00089
1875	0.00108
1876	0.00118
1877	0.00126
1878	0.0014
1879	0.00153
1880	0.0016
1881	0.00166
1882	0.00176
1883	0.00189
1884	0.0021
1885	0.00232
1886	0.00232
1887	0.00253
1888	0.00278
1889	0.00312
1890	0.00334
1891	0.00366
1892	0.00388
1893	0.00378
1894	0.00431
1895	0.00469
1896	0.00496
1897	0.00512
1898	0.00588
1899	0.00626
1900	0.00692
1901	0.00778
1902	0.00847
1903	0.00891
1904	0.01784
1905	0.02676
1906	0.0357
1907	0.04464
1908	0.1116
1909	0.335
1910	0.324
1911	0.2235
1912	0.03354
1913	0.04026
1914	0.04699
1915	0.05372
1916	0.06046
1917	0.0672
1918	0.1793
1919	0.3699
1920	0.6615
1921	0.4487
1922	0.4713
1923	0.4827
1924	0.539
1925	0.5504
1926	0.3259
1927	0.2585
1928	0.3149
1929	0.1912
1930	0.2363
1931	0.2139
1932	0.2027
1933	0.1802
1934	0.2592
1935	0.2706
1936	0.3383
1937	2.303
1938	4.458
1939	8.471
1940	9.589
1941	10.45
1942	9.187
1943	7.952
1944	6.741
1945	5.554
1946	4.39
1947	3.585
1948	2.808
1949	7.663
1950	10.69
1951	13.09
1952	12.72
1953	13.2
1954	16.35
1955	24.93
1956	33.14
1957	44.07
1958	50.83
1959	52.79
1960	49.18
1961	61.17
1962	67.46
1963	77.35
1964	76.24
1965	76.55
1966	85.59
1967	101.7
1968	125.8
1969	136.5
1970	160.3
1971	181.8
1972	189.7
1973	192.7
1974	194
1975	200.6
1976	207.5
1977	245.5
1978	232
1979	251.4
1980	266.5
1981	244.5
1982	225
1983	212.5
1984	188.3
1985	196.9
1986	197.6
1987	189
1988	205.1
1989	207.9
1990	205.9
1991	209.1
1992	214.7
1993	231.2
1994	231.7
1995	237.8
1996	303.4
1997	330.1
1998	290.3
1999	317
2000	350.2