Year	Kilotonnes
1850	0
1851	0.00003
1852	0.00007
1853	0.0001
1854	0.00014
1855	0.00017
1856	0.00021
1857	0.00024
1858	0.00027
1859	0.00031
1860	0.00034
1861	0.00038
1862	0.00041
1863	0.00045
1864	0.00048
1865	0.00052
1866	0.00055
1867	0.00059
1868	0.00062
1869	0.00065
1870	0.00069
1871	0.00072
1872	0.00076
1873	0.00079
1874	0.00083
1875	0.00086
1876	0.0009
1877	0.00093
1878	0.00097
1879	0.001
1880	0.00104
1881	0.0016
1882	0.00216
1883	0.00272
1884	0.00329
1885	0.00385
1886	0.00442
1887	0.00498
1888	0.00555
1889	0.00611
1890	0.00668
1891	0.00699
1892	0.00722
1893	0.00737
1894	0.00741
1895	0.00734
1896	0.01048
1897	0.01359
1898	0.01668
1899	0.02003
1900	0.02328
1901	0.02793
1902	0.04353
1903	0.06135
1904	0.1048
1905	0.09551
1906	0.1107
1907	0.1317
1908	0.147
1909	0.1564
1910	0.1617
1911	0.173
1912	0.2175
1913	0.2477
1914	0.1943
1915	0.1451
1916	0.2422
1917	0.2266
1918	0.2047
1919	0.1557
1920	0.1869
1921	0.1839
1922	0.2203
1923	0.2511
1924	0.2649
1925	0.2637
1926	0.3387
1927	0.3301
1928	0.3296
1929	0.3214
1930	0.3007
1931	0.3001
1932	0.4813
1933	0.6541
1934	0.4968
1935	0.6044
1936	0.829
1937	0.9469
1938	1.192
1939	1.181
1940	0.9237
1941	0.9168
1942	0.7692
1943	0.6071
1944	0.8003
1945	0.854
1946	0.9817
1947	1.16
1948	1.251
1949	1.385
1950	1.013
1951	1.145
1952	0.2885
1953	0.9747
1954	1.874
1955	1.028
1956	1.298
1957	0.5536
1958	0.362
1959	0.0834
1960	0.9372
1961	0.9042
1962	0.4357
1963	0.3507
1964	0.2656
1965	1.236
1966	1.288
1967	1.34
1968	1.052
1969	0.764
1970	0.7084
1971	0.6528
1972	1.853
1973	0.1067
1974	0.4206
1975	2.763
1976	3.253
1977	5.106
1978	1.068
1979	4.109
1980	2.012
1981	8.174
1982	2.816
1983	0.1956
1984	12.96
1985	7.419
1986	5.958
1987	11.12
1988	9.991
1989	20.8
1990	12.85
1991	12.8
1992	13.64
1993	13.42
1994	13.03
1995	13.2
1996	14.5
1997	15.11
1998	16.98
1999	17.53
2000	19.32