Year	Kilotonnes
1850	1.048
1851	0.9745
1852	1.053
1853	1.141
1854	1.442
1855	1.443
1856	2.094
1857	2.176
1858	1.631
1859	2.069
1860	1.818
1861	2.579
1862	2.288
1863	2.533
1864	2.209
1865	3.351
1866	3.117
1867	3.1
1868	3.638
1869	3.204
1870	3.886
1871	4.051
1872	3.858
1873	3.896
1874	4.263
1875	4.911
1876	5.237
1877	5.235
1878	4.932
1879	5.565
1880	6.218
1881	6.641
1882	7.164
1883	8.175
1884	8.218
1885	8.61
1886	8.321
1887	8.585
1888	9.667
1889	10.4
1890	10.04
1891	10.74
1892	10.65
1893	10.32
1894	11.66
1895	11.96
1896	15.43
1897	15.46
1898	15.98
1899	17.81
1900	17.7
1901	18.44
1902	18.74
1903	19.53
1904	21.13
1905	20.57
1906	22.48
1907	20.5
1908	25.06
1909	27.49
1910	25.35
1911	26.97
1912	31.74
1913	33.02
1914	33.19
1915	35.88
1916	33.7
1917	19.58
1918	19.17
1919	20.63
1920	24.39
1921	21.73
1922	31.43
1923	36.08
1924	42.56
1925	37.31
1926	35.12
1927	44.64
1928	41.61
1929	50.61
1930	48.31
1931	49.22
1932	47.81
1933	47.88
1934	50.45
1935	52.14
1936	55.32
1937	56.35
1938	51.71
1939	62.33
1940	39.7
1941	36.82
1942	33.41
1943	38.84
1944	35.2
1945	20.09
1946	48.5
1947	78.55
1948	82.24
1949	114.1
1950	86.58
1951	125.7
1952	118.7
1953	102.1
1954	106.5
1955	132.5
1956	112.1
1957	132.9
1958	118.8
1959	121.1
1960	154.5
1961	164.4
1962	191.8
1963	218.7
1964	227.6
1965	226.7
1966	252.3
1967	266.2
1968	276.3
1969	277.9
1970	287
1971	228.1
1972	202.9
1973	212
1974	224.7
1975	209
1976	181.4
1977	198.2
1978	184.7
1979	206.5
1980	226.1
1981	185.2
1982	189.4
1983	161.4
1984	152.7
1985	169.7
1986	143.9
1987	127.5
1988	125.1
1989	98.39
1990	88
1991	117.5
1992	90
1993	72.5
1994	72.5
1995	68
1996	86
1997	49
1998	36
1999	26.5
2000	13.5