Year	Kilotonnes
1850	0.01238
1851	0.00826
1852	0.01554
1853	0.01399
1854	0.01734
1855	0.01677
1856	0.02307
1857	0.02643
1858	0.02782
1859	0.02627
1860	0.03747
1861	0.03689
1862	0.04122
1863	0.03672
1864	0.04693
1865	0.04635
1866	0.0389
1867	0.0491
1868	0.04754
1869	0.05774
1870	0.05127
1871	0.04675
1872	0.05695
1873	0.05055
1874	0.0569
1875	0.05736
1876	0.06171
1877	0.05428
1878	0.05862
1879	0.05707
1880	0.05162
1881	0.0522
1882	0.05745
1883	0.04278
1884	0.05677
1885	0.05246
1886	0.04894
1887	0.04157
1888	0.05073
1889	0.0406
1890	0.04439
1891	0.04138
1892	0.04715
1893	0.05244
1894	0.0546
1895	0.05522
1896	0.05597
1897	0.05634
1898	0.06804
1899	0.07436
1900	0.08106
1901	0.106
1902	0.1092
1903	0.1244
1904	0.06158
1905	0.2072
1906	0.2485
1907	0.2898
1908	0.331
1909	0.3722
1910	0.4133
1911	0.4686
1912	0.5238
1913	0.579
1914	0.6322
1915	0.6975
1916	0.7852
1917	0.9514
1918	1.267
1919	1.842
1920	1.417
1921	1.519
1922	1.777
1923	2.427
1924	2.298
1925	3.225
1926	5.65
1927	8.935
1928	10.06
1929	10.52
1930	11.54
1931	12.56
1932	13.58
1933	8.896
1934	16.66
1935	18.38
1936	4.009
1937	30.15
1938	12.62
1939	24.46
1940	49.8
1941	63.13
1942	51.31
1943	48.56
1944	73.29
1945	80.24
1946	371.4
1947	99.6
1948	102.9
1949	196.2
1950	176.4
1951	218.8
1952	226.3
1953	266.7
1954	269.3
1955	313.4
1956	341.4
1957	359.8
1958	324.5
1959	375.4
1960	384.8
1961	377.3
1962	397.3
1963	415.7
1964	412.2
1965	428.9
1966	398.8
1967	420.4
1968	423.4
1969	395.3
1970	455.7
1971	409.4
1972	346.4
1973	396.4
1974	420.6
1975	301.9
1976	296.8
1977	326.5
1978	314.4
1979	324.5
1980	329.6
1981	303.5
1982	273.7
1983	242.5
1984	244.3
1985	256.3
1986	246.2
1987	242.9
1988	276.2
1989	269.8
1990	263.6
1991	283.3
1992	278.2
1993	267.2
1994	304.3
1995	295
1996	331.6
1997	319.9
1998	321.3
1999	314.2
2000	370.8