Year	Kilotonnes
1850	0
1851	0
1852	0
1853	0
1854	0
1855	0.00001
1856	0.00001
1857	0.00001
1858	0.00001
1859	0.00001
1860	0.00001
1861	0.00001
1862	0.00001
1863	0.00001
1864	0.00002
1865	0.00002
1866	0.00002
1867	0.00002
1868	0.00002
1869	0.00002
1870	0.00002
1871	0.00002
1872	0.00002
1873	0.00003
1874	0.00003
1875	0.00003
1876	0.00003
1877	0.00003
1878	0.00003
1879	0.00003
1880	0.00003
1881	0.00005
1882	0.00007
1883	0.00009
1884	0.00011
1885	0.00013
1886	0.00014
1887	0.00016
1888	0.00018
1889	0.0002
1890	0.00022
1891	0.00023
1892	0.00023
1893	0.00024
1894	0.00024
1895	0.00024
1896	0.00034
1897	0.00044
1898	0.00054
1899	0.00065
1900	0.00076
1901	0.00091
1902	0.00141
1903	0.00199
1904	0.0034
1905	0.0031
1906	0.00359
1907	0.00428
1908	0.00477
1909	0.00508
1910	0.00525
1911	0.00561
1912	0.00706
1913	0.00804
1914	0.0063
1915	0.00471
1916	0.00786
1917	0.00736
1918	0.00664
1919	0.00505
1920	0.00607
1921	0.00597
1922	0.00715
1923	0.00815
1924	0.0086
1925	0.00856
1926	0.01099
1927	0.01071
1928	0.0107
1929	0.01043
1930	0.00976
1931	0.00974
1932	0.01562
1933	0.02123
1934	0.01612
1935	0.01961
1936	0.0269
1937	0.03073
1938	0.2574
1939	2.07
1940	2.689
1941	2.264
1942	2.377
1943	2.485
1944	4.045
1945	10.88
1946	30.48
1947	45.28
1948	69.45
1949	83.48
1950	116.5
1951	128.7
1952	133.7
1953	157.9
1954	164.2
1955	150.8
1956	137.4
1957	125.2
1958	105.2
1959	107.6
1960	131.5
1961	137.7
1962	137.7
1963	149.2
1964	142.9
1965	161.8
1966	146.7
1967	181.6
1968	184.8
1969	187.7
1970	265.8
1971	248.8
1972	240.9
1973	241.8
1974	252.2
1975	216
1976	231.4
1977	280.7
1978	259.1
1979	312.4
1980	324.9
1981	359.2
1982	347.5
1983	402.2
1984	345.6
1985	390.5
1986	562.8
1987	582.1
1988	543.1
1989	544.9
1990	567.5
1991	500
1992	512.9
1993	450
1994	405.7
1995	358.6
1996	348
1997	284.9
1998	241.3
1999	221
2000	218.4