Year	Kilotonnes
1850	0.00835
1851	0.00937
1852	0.01199
1853	0.02399
1854	0.03601
1855	0.04805
1856	0.0601
1857	0.07217
1858	0.08425
1859	0.09635
1860	0.1085
1861	0.1206
1862	0.1327
1863	0.1449
1864	0.1571
1865	0.1693
1866	0.1815
1867	0.1937
1868	0.2059
1869	0.2182
1870	0.2305
1871	0.2428
1872	0.2551
1873	0.2674
1874	0.2797
1875	0.2921
1876	0.3044
1877	0.3168
1878	0.3292
1879	0.3416
1880	0.3541
1881	0.3665
1882	0.379
1883	0.3914
1884	0.4039
1885	0.4164
1886	0.429
1887	0.4415
1888	0.454
1889	0.4666
1890	0.4792
1891	0.4918
1892	0.5044
1893	0.5171
1894	0.5297
1895	0.5011
1896	0.3713
1897	0.5006
1898	0.5213
1899	0.5421
1900	0.6699
1901	0.8326
1902	0.9426
1903	0.8626
1904	0.8899
1905	1.031
1906	1.03
1907	1.535
1908	1.529
1909	1.667
1910	1.684
1911	1.616
1912	1.807
1913	1.925
1914	3.104
1915	4.283
1916	5.463
1917	6.642
1918	7.821
1919	9.001
1920	10.18
1921	11.36
1922	15.31
1923	9.199
1924	11.1
1925	12.42
1926	13.73
1927	14.86
1928	18.09
1929	21.03
1930	24.8
1931	26.82
1932	25.83
1933	24.1
1934	27.05
1935	30.22
1936	31.87
1937	30.76
1938	35.75
1939	38.83
1940	40.25
1941	42.91
1942	32.99
1943	28.52
1944	24.38
1945	20.51
1946	14.99
1947	30.99
1948	44.59
1949	54.31
1950	63.99
1951	71
1952	62.98
1953	61.38
1954	56.83
1955	63.74
1956	68
1957	76.93
1958	81.33
1959	83.59
1960	91.77
1961	97.82
1962	104
1963	108.7
1964	122
1965	132.9
1966	131
1967	135.1
1968	126.7
1969	133.1
1970	137.6
1971	152.6
1972	164.4
1973	162
1974	174.6
1975	179.2
1976	189.5
1977	191.4
1978	189.2
1979	194.3
1980	203
1981	204
1982	204.5
1983	220
1984	228
1985	239
1986	235
1987	242
1988	251
1989	253
1990	254
1991	223
1992	174
1993	200.5
1994	212
1995	231
1996	217
1997	261
1998	260.5
1999	68.27
2000	68.27