Year	Kilotonnes
1850	0.0005
1851	0.0005
1852	0.00101
1853	0.00151
1854	0.00201
1855	0.00252
1856	0.00302
1857	0.00353
1858	0.00404
1859	0.00454
1860	0.00505
1861	0.01003
1862	0.01502
1863	0.02001
1864	0.02499
1865	0.02998
1866	0.03497
1867	0.03996
1868	0.04495
1869	0.04994
1870	0.05493
1871	0.05992
1872	0.1199
1873	0.1799
1874	0.2399
1875	0.3
1876	0.3602
1877	0.4203
1878	0.4806
1879	0.5408
1880	0.6011
1881	0.6615
1882	0.7219
1883	0.7823
1884	0.8428
1885	0.9034
1886	0.9639
1887	1.025
1888	1.085
1889	1.146
1890	1.207
1891	1.267
1892	1.328
1893	1.389
1894	1.45
1895	1.511
1896	1.572
1897	1.633
1898	1.694
1899	1.755
1900	1.817
1901	1.878
1902	1.939
1903	2
1904	2.062
1905	2.123
1906	2.185
1907	2.246
1908	2.308
1909	2.369
1910	2.431
1911	8.685
1912	28.15
1913	49.02
1914	51.82
1915	64.02
1916	75.18
1917	40.04
1918	62
1919	78.05
1920	84.7
1921	115.1
1922	127
1923	127.4
1924	122.2
1925	123.3
1926	117.1
1927	126.2
1928	84.31
1929	92.69
1930	93.16
1931	108.5
1932	125.2
1933	136.4
1934	123
1935	132.3
1936	156.3
1937	182.7
1938	204
1939	252.7
1940	195.7
1941	228
1942	217.4
1943	224.4
1944	203.6
1945	213.5
1946	200.9
1947	210.1
1948	258
1949	228.8
1950	229.4
1951	171.6
1952	218.1
1953	259
1954	220.8
1955	238.7
1956	253.3
1957	262.5
1958	303.3
1959	244.8
1960	195.2
1961	200.8
1962	216
1963	193.8
1964	236.5
1965	260.4
1966	267.6
1967	141.1
1968	4.935
1969	8.944
1970	88.69
1971	153.3
1972	160.9
1973	176.8
1974	187.3
1975	187.3
1976	186.6
1977	193.8
1978	210.5
1979	275.1
1980	330.6
1981	344.8
1982	334.7
1983	306.6
1984	298.7
1985	302.3
1986	281.2
1987	308.8
1988	333.7
1989	335.5
1990	340.9
1991	375
1992	386.1
1993	294.2
1994	332.6
1995	382.2
1996	407.3
1997	414.1
1998	333.2
1999	348.7
2000	292.6