Year	Kilotonnes
1850	0
1851	0.00002
1852	0.00004
1853	0.00006
1854	0.00008
1855	0.0001
1856	0.00012
1857	0.00014
1858	0.00017
1859	0.00019
1860	0.00021
1861	0.00023
1862	0.00025
1863	0.00027
1864	0.00028
1865	0.0003
1866	0.00032
1867	0.00034
1868	0.00036
1869	0.00038
1870	0.0004
1871	0.00045
1872	0.0005
1873	0.00056
1874	0.00061
1875	0.00074
1876	0.00081
1877	0.00087
1878	0.00096
1879	0.00105
1880	0.0011
1881	0.00115
1882	0.00121
1883	0.0013
1884	0.00145
1885	0.0016
1886	0.0016
1887	0.00175
1888	0.00191
1889	0.00215
1890	0.0023
1891	0.00252
1892	0.00267
1893	0.0026
1894	0.00297
1895	0.00323
1896	0.00342
1897	0.00353
1898	0.00405
1899	0.00431
1900	0.00477
1901	0.00536
1902	0.00583
1903	0.00614
1904	0.00646
1905	0.00688
1906	0.00942
1907	0.01007
1908	0.01078
1909	0.01087
1910	0.01127
1911	0.01206
1912	0.01363
1913	0.01543
1914	0.01611
1915	0.01598
1916	0.01831
1917	0.0199
1918	0.0205
1919	0.02288
1920	0.01813
1921	0.01927
1922	0.0199
1923	0.02159
1924	0.04323
1925	0.06492
1926	0.08666
1927	0.1085
1928	0.1303
1929	0.1522
1930	0.1742
1931	0.1962
1932	0.2182
1933	0.2403
1934	0.2625
1935	0.2847
1936	0.307
1937	0.3293
1938	0.3517
1939	0.3741
1940	0.3966
1941	0.4191
1942	0.4417
1943	0.4644
1944	0.487
1945	0.5098
1946	0.5326
1947	0.5554
1948	0.5783
1949	0.6013
1950	0.5164
1951	0.5266
1952	0.5387
1953	0.5509
1954	0.5669
1955	0.6343
1956	0.7501
1957	0.8407
1958	1.393
1959	1.645
1960	1.557
1961	1.703
1962	2.552
1963	1.913
1964	2.46
1965	2.386
1966	2.415
1967	2.585
1968	3.011
1969	3.305
1970	3.937
1971	4.135
1972	4.454
1973	4.602
1974	4.898
1975	5.408
1976	5.795
1977	6.614
1978	7.561
1979	8.262
1980	9.593
1981	22.59
1982	26.7
1983	29.49
1984	32.75
1985	36.8
1986	39.15
1987	42.45
1988	47.35
1989	43.15
1990	40.45
1991	54.2
1992	48.8
1993	42.8
1994	38.2
1995	37.3
1996	39.2
1997	41.05
1998	40.63
1999	42.93
2000	41.74