Year	Kilotonnes
1850	0
1851	0.1532
1852	0.3063
1853	0.4595
1854	0.6126
1855	0.7658
1856	0.9189
1857	1.072
1858	1.225
1859	1.378
1860	1.532
1861	1.685
1862	1.838
1863	1.991
1864	2.144
1865	2.297
1866	2.451
1867	2.604
1868	2.757
1869	2.91
1870	3.063
1871	3.677
1872	4.303
1873	4.93
1874	5.557
1875	9.281
1876	10.5
1877	11.33
1878	13.65
1879	15.78
1880	16.2
1881	16.77
1882	18.21
1883	20.99
1884	25.91
1885	30.97
1886	29.96
1887	35.04
1888	41.03
1889	49.8
1890	55.27
1891	62.12
1892	65.65
1893	61.71
1894	73.79
1895	76.78
1896	80.81
1897	82.14
1898	97.67
1899	103.4
1900	111.8
1901	129.6
1902	140.4
1903	151.4
1904	156
1905	169.1
1906	186.3
1907	198.6
1908	210.8
1909	221.6
1910	233.2
1911	257.8
1912	293.6
1913	317.1
1914	328.5
1915	320
1916	387.5
1917	431.8
1918	414.4
1919	421.8
1920	385.7
1921	335.2
1922	346.5
1923	365.9
1924	383.1
1925	399.9
1926	401.1
1927	419.8
1928	424.4
1929	439
1930	418.6
1931	383.2
1932	376.7
1933	412.6
1934	444
1935	462.1
1936	496.9
1937	527.1
1938	560.3
1939	585.5
1940	632.3
1941	629.1
1942	619.1
1943	656.1
1944	625.8
1945	328.1
1946	224.4
1947	297.1
1948	361.3
1949	408.5
1950	449.8
1951	543.1
1952	590
1953	673
1954	659.6
1955	670.7
1956	770.9
1957	872
1958	851.8
1959	900.4
1960	1066
1961	1190
1962	1252
1963	1352
1964	1435
1965	1491
1966	1636
1967	1860
1968	2046
1969	2233
1970	2486
1971	2167
1972	1921
1973	1803
1974	1608
1975	1293
1976	841
1977	842.6
1978	708.4
1979	681.5
1980	638.5
1981	624.9
1982	566.7
1983	524.5
1984	521.6
1985	456.6
1986	417.5
1987	403.2
1988	426
1989	438
1990	488
1991	484.5
1992	465
1993	443.5
1994	472
1995	457.5
1996	438.5
1997	437.5
1998	427
1999	404.5
2000	410