Year	Kilotonnes
1850	0.00259
1851	0.00281
1852	0.00308
1853	0.00327
1854	0.00352
1855	0.00363
1856	0.0038
1857	0.00373
1858	0.00379
1859	0.00411
1860	0.00455
1861	0.00479
1862	0.00485
1863	0.00506
1864	0.00543
1865	0.00575
1866	0.00595
1867	0.00622
1868	0.00632
1869	0.00667
1870	0.00671
1871	0.00698
1872	0.00771
1873	0.00812
1874	0.00787
1875	0.00826
1876	0.00844
1877	0.00862
1878	0.00869
1879	0.00889
1880	0.00984
1881	0.01041
1882	0.01083
1883	0.01137
1884	0.01116
1885	0.01126
1886	0.01098
1887	0.01155
1888	0.01199
1889	0.01267
1890	0.01328
1891	0.01361
1892	0.01338
1893	0.01286
1894	0.0139
1895	0.01423
1896	0.01502
1897	0.01545
1898	0.01567
1899	0.0167
1900	0.01739
1901	0.01732
1902	0.01752
1903	0.01807
1904	0.01849
1905	0.01884
1906	0.02002
1907	0.02108
1908	0.02115
1909	0.02144
1910	0.02225
1911	0.02262
1912	0.02347
1913	0.02429
1914	0.022
1915	0.02241
1916	0.0243
1917	0.02361
1918	0.02221
1919	0.01972
1920	0.02054
1921	0.01844
1922	0.02006
1923	0.02026
1924	0.02316
1925	0.02311
1926	0.01852
1927	0.02519
1928	0.02513
1929	0.02756
1930	0.02591
1931	0.02351
1932	0.02171
1933	0.0222
1934	0.02398
1935	0.02501
1936	0.0262
1937	0.0286
1938	0.02843
1939	0.02983
1940	0.02879
1941	0.03023
1942	0.03269
1943	0.03574
1944	0.03471
1945	0.01806
1946	0.02651
1947	0.02882
1948	0.0299
1949	0.03069
1950	0.02903
1951	0.03373
1952	0.03495
1953	0.03515
1954	0.03659
1955	0.03902
1956	0.04117
1957	0.04271
1958	0.04216
1959	0.04137
1960	0.04224
1961	0.04403
1962	0.04717
1963	0.05066
1964	0.05331
1965	0.05441
1966	0.05348
1967	0.05432
1968	0.05568
1969	0.05555
1970	0.05798
1971	0.05675
1972	0.05673
1973	0.05909
1974	0.05961
1975	0.05711
1976	0.05606
1977	0.05513
1978	0.05365
1979	0.05606
1980	0.05617
1981	0.05186
1982	0.04964
1983	0.0461
1984	0.04441
1985	0.04333
1986	0.04313
1987	0.04216
1988	0.03839
1989	0.03855
1990	0.0365
1991	0.0505
1992	0.052
1993	0.054
1994	0.048
1995	0.0455
1996	0.041
1997	0.0385
1998	0.037
1999	0.03552
2000	0.03405