Year	Kilotonnes
1850	39.5
1851	40.36
1852	43.45
1853	51.02
1854	58.74
1855	67.21
1856	71.06
1857	73.49
1858	72.58
1859	73.79
1860	79.97
1861	85.93
1862	89.86
1863	90.78
1864	96.47
1865	102
1866	111.7
1867	113.1
1868	115.2
1869	118.2
1870	102.8
1871	102.4
1872	124.4
1873	133.6
1874	127.5
1875	133.6
1876	134.3
1877	131.5
1878	133.9
1879	139.5
1880	156.8
1881	160.8
1882	170.5
1883	179.4
1884	173.5
1885	166
1886	163.5
1887	171.6
1888	177.8
1889	180.6
1890	200.5
1891	201.1
1892	201.3
1893	197.2
1894	208.9
1895	209.6
1896	216.5
1897	227.2
1898	234
1899	250.3
1900	276.3
1901	264.6
1902	247.7
1903	265.3
1904	257.4
1905	256.1
1906	289.1
1907	313.2
1908	318.1
1909	329.8
1910	334.7
1911	356.5
1912	361.6
1913	406.1
1914	288.8
1915	272.2
1916	292.8
1917	312.5
1918	286.7
1919	325.9
1920	458.4
1921	382
1922	468
1923	533.8
1924	588.4
1925	565.5
1926	561.7
1927	591.2
1928	585.2
1929	666.7
1930	682.7
1931	604.1
1932	521.3
1933	538.5
1934	534.9
1935	508.5
1936	530.4
1937	613.5
1938	570.1
1939	575.1
1940	401.4
1941	327.6
1942	348.9
1943	373.4
1944	252.1
1945	344.8
1946	559.1
1947	675.1
1948	719.4
1949	826.8
1950	721.4
1951	866.4
1952	908
1953	841
1954	870.7
1955	859.7
1956	965.4
1957	970.9
1958	947.7
1959	898.5
1960	876.7
1961	913.5
1962	960.6
1963	1089
1964	1183
1965	1248
1966	1277
1967	1369
1968	1364
1969	1410
1970	1545
1971	1610
1972	1706
1973	1996
1974	1996
1975	1738
1976	1706
1977	1545
1978	1610
1979	1706
1980	1631
1981	1282
1982	1229
1983	1012
1984	903
1985	754.1
1986	689.2
1987	680.5
1988	627.8
1989	709.6
1990	663
1991	722
1992	630.5
1993	546.5
1994	520.5
1995	489
1996	477
1997	403
1998	411.5
1999	352.5
2000	313.5