Year	Kilotonnes
1850	0.00015
1851	0.00012
1852	0.00015
1853	0.00006
1854	0.00003
1855	0.00003
1856	0.00013
1857	0.00013
1858	0.00013
1859	0.00013
1860	0.00016
1861	0.00016
1862	0.00019
1863	0.00022
1864	0.00028
1865	0.00025
1866	0.00038
1867	0.0005
1868	0.00053
1869	0.00053
1870	0.00028
1871	0.00035
1872	0.00038
1873	0.00038
1874	0.00035
1875	0.00035
1876	0.00035
1877	0.00038
1878	0.00029
1879	0.0003
1880	0.00032
1881	0.00057
1882	0.00064
1883	0.00076
1884	0.00091
1885	0.00083
1886	0.00021
1887	0.00145
1888	0.00104
1889	0.00353
1890	0.00415
1891	0.00893
1892	0.00519
1893	0.00665
1894	0.00581
1895	0.00498
1896	0.00104
1897	0.00457
1898	0.01225
1899	0.01661
1900	0.02077
1901	0.02076
1902	0.02075
1903	0.01203
1904	0.01181
1905	0.01512
1906	0.01657
1907	0.01738
1908	0.01572
1909	0.0122
1910	0.01364
1911	0.02003
1912	0.02023
1913	0.02043
1914	0.02062
1915	0.01731
1916	0.01216
1917	0.0105
1918	0.00844
1919	0.0107
1920	0.00637
1921	0.00532
1922	0.00732
1923	0.00546
1924	0.00724
1925	0.0068
1926	0.1287
1927	0.09325
1928	0.1847
1929	0.06247
1930	0.1904
1931	0.01506
1932	0.00959
1933	0.00954
1934	0.01631
1935	0.01545
1936	0.00918
1937	0.01247
1938	0.01776
1939	0.02207
1940	0.02193
1941	0.0199
1942	0.01217
1943	0.00957
1944	0.01052
1945	0.00711
1946	0.00583
1947	0.00441
1948	0.00604
1949	0.00415
1950	1.508
1951	2.189
1952	3.821
1953	2.948
1954	3.826
1955	3.914
1956	6.83
1957	4.845
1958	3.978
1959	3.454
1960	3.272
1961	1.597
1962	1.148
1963	1.996
1964	4.471
1965	5.889
1966	5.099
1967	5.7
1968	4.603
1969	4.857
1970	6.065
1971	4.748
1972	1.135
1973	2.272
1974	2.427
1975	2.318
1976	1.54
1977	2.519
1978	0.8369
1979	1.812
1980	2.634
1981	1.892
1982	1.461
1983	1.993
1984	2.054
1985	3.506
1986	3.388
1987	2.876
1988	3.284
1989	4.041
1990	3.194
1991	3.252
1992	3.311
1993	3.371
1994	3.432
1995	3.494
1996	3.557
1997	3.621
1998	3.687
1999	3.754
2000	3.822