Year	Kilotonnes
1850	24.71
1851	26.96
1852	30.29
1853	31.34
1854	34.86
1855	35.78
1856	35.46
1857	37.05
1858	38.88
1859	40.12
1860	40.97
1861	44.31
1862	44.02
1863	46.39
1864	48.69
1865	51.36
1866	55.59
1867	60.9
1868	54.74
1869	58.81
1870	67.17
1871	64.67
1872	69.46
1873	77.44
1874	71.11
1875	74.52
1876	73.3
1877	71.19
1878	75.49
1879	76.89
1880	84.5
1881	85.35
1882	90.16
1883	95.83
1884	94.22
1885	92
1886	88.64
1887	93.57
1888	99.1
1889	101
1890	111
1891	105.5
1892	105.1
1893	100.3
1894	110.8
1895	112
1896	117.5
1897	122.1
1898	125.5
1899	133.4
1900	141.5
1901	131
1902	136.1
1903	145.7
1904	147.9
1905	149
1906	169.6
1907	170.9
1908	156.3
1909	167.5
1910	177
1911	173.2
1912	174.5
1913	173.7
1914	123.4
1915	101.5
1916	115.7
1917	107.9
1918	101.6
1919	126.7
1920	150
1921	149.8
1922	156.3
1923	206.5
1924	214.4
1925	215.5
1926	223.5
1927	288.1
1928	301.2
1929	371.2
1930	389
1931	366
1932	313.3
1933	349.1
1934	383
1935	386
1936	365.7
1937	403.1
1938	311.1
1939	299.5
1940	244.5
1941	239.6
1942	216.6
1943	198.6
1944	133.6
1945	140
1946	212
1947	270.8
1948	306.9
1949	331.1
1950	298.5
1951	358.8
1952	360.6
1953	343.3
1954	334.5
1955	326.5
1956	382.9
1957	399.1
1958	409
1959	376.7
1960	365
1961	375.8
1962	404
1963	524.4
1964	540.7
1965	561
1966	520.2
1967	501.1
1968	547.9
1969	554.9
1970	565
1971	499.7
1972	529.1
1973	522.1
1974	508.4
1975	429.5
1976	403
1977	439
1978	382.3
1979	406.2
1980	414
1981	356
1982	347
1983	280
1984	250
1985	200
1986	188.5
1987	183.5
1988	177
1989	162.5
1990	177.5
1991	176.5
1992	173.5
1993	160.5
1994	140.5
1995	128
1996	127
1997	113
1998	107
1999	88
2000	84.5