Year	Kilotonnes
1850	0
1851	0
1852	0
1853	0
1854	0
1855	0
1856	0
1857	0
1858	0
1859	0
1860	0
1861	0
1862	0
1863	0
1864	0
1865	0
1866	0
1867	0
1868	0
1869	0
1870	0
1871	0
1872	0
1873	0
1874	0
1875	0
1876	0
1877	0
1878	0
1879	0
1880	0
1881	0
1882	0
1883	0
1884	0
1885	0
1886	0
1887	0
1888	0
1889	0
1890	0
1891	0
1892	0
1893	0
1894	0
1895	0
1896	0
1897	0
1898	0
1899	0
1900	0
1901	0
1902	0
1903	0
1904	0
1905	0
1906	0
1922	1.907
1923	2.003
1924	2.1
1925	2.196
1926	2.292
1927	2.389
1928	1.912
1929	2.629
1930	1.793
1931	2.033
1932	2.273
1933	1.197
1934	2.275
1935	2.395
1936	2.037
1937	0.839
1938	1.559
1939	1.919
1940	1.44
1941	1.92
1942	1.921
1943	1.081
1944	1.562
1945	6.731
1946	9.379
1947	13.83
1948	19.49
1949	17.09
1950	31.61
1951	34.58
1952	39.63
1953	38.16
1954	38.95
1955	48.6
1956	57.93
1957	67.33
1958	65.41
1959	61.15
1960	62.25
1961	108.9
1962	100.4
1963	96.9
1964	96.81
1965	94.1
1966	93.95
1967	93.67
1968	115.7
1969	121.9
1970	117.5
1971	124.6
1972	113.2
1973	114.9
1974	113.7
1975	101.6
1976	87.31
1977	88.6
1978	86.44
1979	87.18
1980	108.9
1981	99.03
1982	96.52
1983	78.33
1984	61.6
1985	53.85
1986	51.51
1987	49.77
1988	48.87
1989	48.35
1990	41.87
1991	43.26
1992	41.29
1993	42.45
1994	40.85
1995	43.21
1996	39.42
1997	40.89
1998	43.93
1999	44.83
2000	46.63