Year	Kilotonnes
1850	10.82
1851	10.7
1852	12.92
1853	14.21
1854	20.1
1855	15.77
1856	16.39
1857	14.86
1858	12.92
1859	12.34
1860	16.63
1861	15.39
1862	19.91
1863	14.35
1864	11.92
1865	13.44
1866	14.69
1867	14.22
1868	14.87
1869	15.25
1870	17.18
1871	17.35
1872	18.3
1873	17.53
1874	16.39
1875	18.58
1876	21.53
1877	21.93
1878	22.96
1879	24.73
1880	27.25
1881	27.31
1882	27.7
1883	30.45
1884	30.35
1885	31.55
1886	31.69
1887	32.68
1888	36.36
1889	35.6
1890	34.42
1891	39.83
1892	37.87
1893	37.96
1894	38.98
1895	38.72
1896	41.32
1897	43.22
1898	42.13
1899	44.01
1900	48.76
1901	47.65
1902	47.07
1903	50.3
1904	53.66
1905	54.98
1906	60.26
1907	63.09
1908	63.99
1909	66.95
1910	69.8
1911	74.02
1912	83.55
1913	93.13
1914	87.1
1915	83.19
1916	73.66
1917	56.54
1918	46.2
1919	69.56
1920	67.89
1921	68.59
1922	84.17
1923	88.29
1924	103.3
1925	111.4
1926	113.1
1927	128.7
1928	135.7
1929	150.9
1930	153
1931	165.7
1932	152.4
1933	140.4
1934	139.5
1935	130
1936	133.1
1937	139.8
1938	129.5
1939	132.8
1940	122.4
1941	121.9
1942	106
1943	99.64
1944	69.84
1945	49.24
1946	74.76
1947	99.49
1948	111.9
1949	135.5
1950	183.1
1951	205.9
1952	212.6
1953	212.3
1954	227.3
1955	241.4
1956	272.2
1957	276.3
1958	268.4
1959	268.6
1960	306
1961	326.6
1962	374.7
1963	426.3
1964	466.1
1965	484.8
1966	444.8
1967	415.1
1968	394.1
1969	398.3
1970	403.5
1971	334.5
1972	315.4
1973	304.2
1974	272.4
1975	213.5
1976	231.3
1977	238.5
1978	217.8
1979	247.3
1980	245
1981	232
1982	202
1983	161.5
1984	149.5
1985	129
1986	132
1987	131.5
1988	125
1989	102
1990	102
1991	86.5
1992	83.5
1993	80
1994	73
1995	71
1996	68
1997	59
1998	55
1999	52.5
2000	45.5