Year	Kilotonnes
1850	0
1851	0.00922
1852	0.01843
1853	0.02765
1854	0.03686
1855	0.04608
1856	0.0553
1857	0.06451
1858	0.07373
1859	0.08294
1860	0.09216
1861	0.1009
1862	0.1096
1863	0.1183
1864	0.1268
1865	0.1353
1866	0.1437
1867	0.152
1868	0.1602
1869	0.1684
1870	0.1764
1871	0.2006
1872	0.2249
1873	0.2491
1874	0.2732
1875	0.3303
1876	0.3606
1877	0.3867
1878	0.4287
1879	0.4685
1880	0.4911
1881	0.5104
1882	0.5386
1883	0.5808
1884	0.6455
1885	0.7114
1886	0.7121
1887	0.7775
1888	0.8524
1889	0.9567
1890	1.026
1891	1.122
1892	1.191
1893	1.16
1894	1.324
1895	1.44
1896	1.523
1897	1.571
1898	1.804
1899	2.441
1900	1.779
1901	2.328
1902	2.94
1903	2.684
1904	2.366
1905	2.651
1906	2.802
1907	2.839
1908	3.079
1909	3.409
1910	4.432
1911	3.865
1912	3.83
1913	4.472
1914	5.514
1915	5.73
1916	6.097
1917	5.823
1918	5.665
1919	5.925
1920	6.239
1921	8.212
1922	8.821
1923	9.431
1924	11.03
1925	12.17
1926	11.52
1927	13.28
1928	17.45
1929	17.37
1930	17.23
1931	15.25
1932	15.14
1933	14.04
1934	14.26
1935	15.91
1936	19.6
1937	20.7
1938	20.95
1939	23.47
1940	22.44
1941	20.92
1942	11.17
1943	9.167
1944	4.828
1945	2.078
1946	2.357
1947	2.232
1948	3.196
1949	3.413
1950	12.02
1951	20.63
1952	29.23
1953	37.84
1954	46.45
1955	55.05
1956	44.39
1957	38.56
1958	78.54
1959	114.5
1960	136
1961	143.2
1962	177.9
1963	168.2
1964	180.3
1965	190
1966	197.3
1967	165.4
1968	175.5
1969	175.6
1970	24.98
1971	23.66
1972	18.12
1973	25.16
1974	30.08
1975	41.72
1976	43.87
1977	47.92
1978	46.41
1979	48.11
1980	48.54
1981	48.44
1982	49.37
1983	51.1
1984	43.5
1985	46.2
1986	52
1987	56.65
1988	57.95
1989	54.1
1990	56.5
1991	57
1992	67.45
1993	67.1
1994	68.2
1995	66.5
1996	111.1
1997	136.5
1998	110.8
1999	96
2000	88.83