Year	Kilotonnes
1850	0
1851	0.00024
1852	0.00047
1853	0.00071
1854	0.00095
1855	0.00118
1856	0.00142
1857	0.00166
1858	0.00189
1859	0.00213
1860	0.00237
1861	0.00259
1862	0.00282
1863	0.00304
1864	0.00326
1865	0.00347
1866	0.00369
1867	0.0039
1868	0.00411
1869	0.00432
1870	0.00453
1871	0.00515
1872	0.00578
1873	0.0064
1874	0.00702
1875	0.00849
1876	0.00926
1877	0.00993
1878	0.01101
1879	0.01203
1880	0.01262
1881	0.01311
1882	0.01384
1883	0.01492
1884	0.01658
1885	0.01827
1886	0.01829
1887	0.01997
1888	0.0219
1889	0.02458
1890	0.02634
1891	0.02883
1892	0.0306
1893	0.02979
1894	0.034
1895	0.03698
1896	0.03913
1897	0.04036
1898	0.04634
1899	0.04935
1900	0.05453
1901	0.0613
1902	0.06675
1903	0.07027
1904	0.07389
1905	0.0787
1906	0.1078
1907	0.1152
1908	0.1233
1909	0.1244
1910	0.129
1911	0.138
1912	0.1559
1913	0.1765
1914	0.1843
1915	0.1828
1916	0.2094
1917	0.2277
1918	0.2345
1919	0.2617
1920	0.2074
1921	0.2204
1922	0.2277
1923	0.247
1924	0.2613
1925	0.2647
1926	0.2664
1927	0.2806
1928	0.2875
1929	0.2951
1930	0.2949
1931	0.2782
1932	0.2694
1933	0.2871
1934	0.3161
1935	0.3361
1936	0.3574
1937	0.3687
1938	0.3726
1939	0.4028
1940	0.4538
1941	0.4818
1942	0.4816
1943	0.4605
1944	0.4508
1945	0.2801
1946	0.2291
1947	0.2588
1948	0.2709
1949	0.3572
1950	0.4096
1951	0.483
1952	0.5551
1953	0.5993
1954	0.6373
1955	0.7065
1956	0.7804
1957	0.8715
1958	1.253
1959	1.548
1960	1.698
1961	1.437
1962	1.348
1963	1.393
1964	1.407
1965	1.671
1966	1.783
1967	2.569
1968	3.055
1969	3.21
1970	1.369
1971	1.563
1972	3.081
1973	9.683
1974	9.969
1975	5.978
1976	0.9979
1977	2.416
1978	1.825
1979	8.888
1980	10.27
1981	5.395
1982	5.526
1983	5.174
1984	12.08
1985	9.5
1986	9.65
1987	8.65
1988	9
1989	9.45
1990	8.4
1991	9.2
1992	10.65
1993	11.55
1994	14.95
1995	17.9
1996	16.65
1997	16.6
1998	15.32
1999	17.09
2000	15.95