Year	Kilotonnes
1850	0
1851	0.00024
1852	0.00048
1853	0.00071
1854	0.00095
1855	0.00119
1856	0.00143
1857	0.00167
1858	0.00191
1859	0.00214
1860	0.00238
1861	0.00261
1862	0.00283
1863	0.00305
1864	0.00328
1865	0.00349
1866	0.00371
1867	0.00393
1868	0.00414
1869	0.00435
1870	0.00456
1871	0.00518
1872	0.00581
1873	0.00643
1874	0.00706
1875	0.00853
1876	0.00932
1877	0.00999
1878	0.01107
1879	0.0121
1880	0.01269
1881	0.01318
1882	0.01391
1883	0.015
1884	0.01667
1885	0.01838
1886	0.01839
1887	0.02008
1888	0.02202
1889	0.02471
1890	0.02649
1891	0.02899
1892	0.03077
1893	0.02996
1894	0.03419
1895	0.03719
1896	0.03935
1897	0.04059
1898	0.0466
1899	0.04962
1900	0.05484
1901	0.06164
1902	0.06712
1903	0.07067
1904	0.07431
1905	0.07914
1906	0.1084
1907	0.1159
1908	0.124
1909	0.1251
1910	0.1297
1911	0.1388
1912	0.1568
1913	0.5824
1914	1.434
1915	4.435
1916	8.062
1917	10.83
1918	13.63
1919	16.89
1920	21.3
1921	25.71
1922	33.2
1923	39.72
1924	43.56
1925	46.81
1926	52.12
1927	54.67
1928	59.04
1929	62.45
1930	63.71
1931	62.32
1932	60.65
1933	63.04
1934	65.26
1935	67.78
1936	70.34
1937	73.32
1938	75.55
1939	77.56
1940	81.09
1941	82.67
1942	83.88
1943	86.95
1944	88.88
1945	90.48
1946	91.3
1947	92.92
1948	95.69
1949	97.29
1950	80.05
1951	91.38
1952	96.77
1953	93.54
1954	84.51
1955	88.5
1956	90.54
1957	68.53
1958	66.69
1959	66.69
1960	57.34
1961	45.64
1962	44.04
1963	49.07
1964	75.21
1965	73.17
1966	77.62
1967	84.32
1968	85.71
1969	77.54
1970	70.15
1971	50.48
1972	41.71
1973	41.43
1974	43.93
1975	49.48
1976	68.25
1977	86.03
1978	87.12
1979	85.54
1980	93.78
1981	94.54
1982	77.38
1983	93.07
1984	92.39
1985	88.25
1986	86
1987	83.45
1988	86.95
1989	100.5
1990	127.9
1991	116.2
1992	110
1993	123
1994	125.5
1995	133.4
1996	147.4
1997	156.2
1998	128.9
1999	113
2000	130.1