Year	Kilotonnes
1850	0.00007
1851	0.00007
1852	0.00015
1853	0.00022
1854	0.0003
1855	0.00037
1856	0.00045
1857	0.00052
1858	0.0006
1859	0.00068
1860	0.00075
1861	0.00149
1862	0.00223
1863	0.00297
1864	0.00371
1865	0.00446
1866	0.0052
1867	0.00594
1868	0.00668
1869	0.00742
1870	0.00816
1871	0.0089
1872	0.00968
1873	0.01045
1874	0.01122
1875	0.01199
1876	0.01277
1877	0.01354
1878	0.01431
1879	0.01508
1880	0.01586
1881	0.01796
1882	0.01674
1883	0.01685
1884	0.01696
1885	0.01866
1886	0.02036
1887	0.02206
1888	0.02384
1889	0.0265
1890	0.02802
1891	0.0236
1892	0.03045
1893	0.0266
1894	0.03307
1895	0.02919
1896	0.03283
1897	0.037
1898	0.03825
1899	0.03859
1900	0.04611
1901	0.05022
1902	0.02647
1903	0.02898
1904	0.03442
1905	0.03738
1906	0.03655
1907	0.03958
1908	0.0519
1909	0.04757
1910	0.05676
1911	0.04932
1912	0.05651
1913	0.06458
1914	0.06981
1915	0.07982
1916	0.08778
1917	0.07539
1918	0.08093
1919	0.08854
1920	0.09291
1921	0.1275
1922	0.1314
1923	0.161
1924	0.1699
1925	0.1683
1926	0.1653
1927	0.1807
1928	0.1875
1929	0.2109
1930	0.2297
1931	0.1893
1932	0.1578
1933	0.1905
1934	0.2299
1935	0.2464
1936	0.2555
1937	0.3255
1938	0.3128
1939	0.3332
1940	0.3098
1941	0.3195
1942	0.3257
1943	0.3267
1944	0.3174
1945	0.3147
1946	0.3049
1947	0.3222
1948	0.3749
1949	0.3881
1950	0.4056
1951	0.4041
1952	0.4449
1953	0.4654
1954	0.4782
1955	0.5048
1956	0.5569
1957	0.5697
1958	0.5821
1959	0.6064
1960	0.5625
1961	0.5129
1962	0.4633
1963	0.4137
1964	0.3641
1965	0.3145
1966	0.2648
1967	0.2152
1968	0.3213
1969	0.4274
1970	0.5335
1971	1.575
1972	1.552
1973	1.599
1974	1.78
1975	1.908
1976	1.906
1977	1.928
1978	1.834
1979	1.909
1980	2.075
1981	2.086
1982	1.874
1983	8.998
1984	7.502
1985	7.956
1986	7.568
1987	7.437
1988	5.818
1989	6.477
1990	7.025
1991	7.476
1992	7.152
1993	7.62
1994	4.792
1995	7.38
1996	5.435
1997	4.794
1998	2.258
1999	2.464
2000	9.709