Year	Kilotonnes
1850	0.00007
1851	0.00007
1852	0.00014
1853	0.00021
1854	0.00029
1855	0.00036
1856	0.00043
1857	0.0005
1858	0.00057
1859	0.00065
1860	0.00072
1861	0.00143
1862	0.00214
1863	0.00285
1864	0.00356
1865	0.00427
1866	0.00498
1867	0.00569
1868	0.0064
1869	0.00711
1870	0.00782
1871	0.00853
1872	0.00927
1873	0.01001
1874	0.01074
1875	0.01148
1876	0.01222
1877	0.01296
1878	0.0137
1879	0.01444
1880	0.01518
1881	0.01719
1882	0.01603
1883	0.01613
1884	0.01624
1885	0.01787
1886	0.0195
1887	0.02113
1888	0.02283
1889	0.02538
1890	0.02683
1891	0.0226
1892	0.02916
1893	0.02547
1894	0.03166
1895	0.02795
1896	0.03144
1897	0.03542
1898	0.03663
1899	0.03695
1900	0.04414
1901	0.04808
1902	0.02534
1903	0.02775
1904	0.03296
1905	0.06593
1906	0.09894
1907	0.132
1908	1.538
1909	1.57
1910	1.603
1911	1.635
1912	1.668
1913	3.07
1914	4.47
1915	7.238
1916	7.267
1917	5.93
1918	4.595
1919	4.626
1920	4.657
1921	4.668
1922	4.679
1923	4.689
1924	5.868
1925	3.882
1926	2.754
1927	6.526
1928	11.08
1929	11.61
1930	13.94
1931	13.8
1932	90.98
1933	138.1
1934	180.4
1935	187.7
1936	185.6
1937	264.7
1938	268.5
1939	265.8
1940	327.2
1941	282.1
1942	301.8
1943	303.3
1944	264.3
1945	230.2
1946	215.2
1947	226.7
1948	247.5
1949	295.8
1950	310.5
1951	342.6
1952	341.7
1953	391.6
1954	419.6
1955	374.7
1956	415.8
1957	443.1
1958	401.5
1959	537.3
1960	562.2
1961	553.8
1962	534.1
1963	550.8
1964	598.8
1965	653.1
1966	574
1967	608.9
1968	732.1
1969	735.3
1970	724.8
1971	670.3
1972	741.2
1973	801.6
1974	887.4
1975	742.1
1976	744.5
1977	768.9
1978	744.6
1979	676
1980	758.6
1981	708.2
1982	680
1983	661.3
1984	580.2
1985	543.9
1986	529.2
1987	536.2
1988	502.2
1989	542.3
1990	505.3
1991	497.4
1992	568.7
1993	559.3
1994	390.8
1995	382.9
1996	415
1997	450
1998	479.2
1999	458.7
2000	431.2