Year	Kilotonnes
1850	0.00055
1851	0.00069
1852	0.00077
1853	0.00088
1854	0.00105
1855	0.00114
1856	0.00122
1857	0.00127
1858	0.00133
1859	0.00146
1860	0.00154
1861	0.0015
1862	0.00157
1863	0.00179
1864	0.00191
1865	0.00198
1866	0.00227
1867	0.00235
1868	0.00263
1869	0.00292
1870	0.00311
1871	0.00326
1872	0.00391
1873	0.00427
1874	0.00415
1875	0.00424
1876	0.00418
1877	0.00458
1878	0.00448
1879	0.00534
1880	0.006
1881	0.00637
1882	0.00713
1883	0.0078
1884	0.00829
1885	0.0084
1886	0.00868
1887	0.00989
1888	0.01134
1889	0.01078
1890	0.01201
1891	0.0129
1892	0.0137
1893	0.01388
1894	0.01312
1895	0.01464
1896	0.01484
1897	0.0155
1898	0.0169
1899	0.0193
1900	0.02047
1901	0.02228
1902	0.02319
1903	0.02719
1904	0.02721
1905	0.03034
1906	0.03191
1907	0.03621
1908	0.03262
1909	0.03595
1910	0.0389
1911	0.03898
1912	0.04215
1913	0.04523
1914	0.04083
1915	0.04282
1916	0.04892
1917	0.05327
1918	0.05571
1919	0.04515
1920	0.05216
1921	0.041
1922	0.0408
1923	0.05483
1924	0.0488
1925	0.0496
1926	0.05328
1927	0.05303
1928	0.05124
1929	0.05484
1930	0.04862
1931	0.04011
1932	0.03281
1933	0.03499
1934	0.03854
1935	0.03985
1936	0.0462
1937	0.04883
1938	0.04044
1939	0.04558
1940	0.05134
1941	0.05835
1942	0.06223
1943	0.06725
1944	0.0676
1945	0.06429
1946	0.05838
1947	0.06573
1948	0.06209
1949	0.05384
1950	0.05749
1951	0.05657
1952	0.1382
1953	0.03895
1954	0.05082
1955	0.01349
1956	0.02925
1957	0.01501
1958	0.01403
1959	0.01338
1960	0.01327
1961	0.5564
1962	1.1
1963	1.643
1964	2.186
1965	2.729
1966	3.272
1967	19.52
1968	37.67
1969	51.79
1970	85.89
1971	102.7
1972	103.8
1973	141.4
1974	148.9
1975	147.5
1976	149.7
1977	169.9
1978	169.4
1979	157
1980	175.1
1981	138.8
1982	111.3
1983	76.25
1984	76.55
1985	63.1
1986	61.37
1987	75.83
1988	65.04
1989	80.12
1990	74.67
1991	78.38
1992	82.28
1993	86.37
1994	90.66
1995	95.17
1996	99.9
1997	104.9
1998	110.1
1999	115.5
2000	121.3