Year	Kilotonnes
1850	0.00482
1851	0.00321
1852	0.00604
1853	0.00544
1854	0.00675
1855	0.00652
1856	0.00897
1857	0.01028
1858	0.01082
1859	0.01022
1860	0.01457
1861	0.01435
1862	0.01603
1863	0.01428
1864	0.01825
1865	0.01803
1866	0.01513
1867	0.0191
1868	0.01849
1869	0.02246
1870	0.01994
1871	0.01818
1872	0.02215
1873	0.01966
1874	0.02213
1875	0.02231
1876	0.024
1877	0.02111
1878	0.0228
1879	0.0222
1880	0.02008
1881	0.0203
1882	0.02234
1883	0.01664
1884	0.02208
1885	0.0204
1886	0.01903
1887	0.01617
1888	0.01973
1889	0.01579
1890	0.01726
1891	0.01609
1892	0.01834
1893	0.02039
1894	0.02124
1895	0.02148
1896	0.02177
1897	0.02191
1898	0.02646
1899	0.02892
1900	0.03153
1901	0.04124
1902	0.04246
1903	0.04839
1904	0.05083
1905	0.05674
1906	0.05645
1907	0.06124
1908	0.06744
1909	0.07336
1910	0.07498
1911	0.08887
1912	0.08845
1913	0.07949
1914	0.07875
1915	0.09723
1916	0.1177
1917	0.1419
1918	0.158
1919	0.1326
1920	0.1428
1921	0.1183
1922	0.1402
1923	0.1797
1924	0.1789
1925	0.1942
1926	0.2108
1927	0.2315
1928	0.2772
1929	0.2973
1930	0.2592
1931	0.2326
1932	0.1598
1933	0.1926
1934	0.2489
1935	0.2605
1936	0.2659
1937	0.3613
1938	0.3553
1939	0.3504
1940	0.3656
1941	0.4166
1942	0.3875
1943	0.4278
1944	0.4473
1945	0.4707
1946	0.5325
1947	0.4974
1948	0.5165
1949	0.5341
1950	0.6814
1951	0.7552
1952	0.7362
1953	0.7254
1954	0.7378
1955	0.7912
1956	0.8203
1957	0.8359
1958	0.8098
1959	0.8298
1960	0.84
1961	2.486
1962	3.269
1963	4.835
1964	4.766
1965	7.83
1966	6.173
1967	3.041
1968	4.493
1969	4.424
1970	3.63
1971	5.002
1972	4.772
1973	4.866
1974	4.939
1975	4.497
1976	4.209
1977	4.424
1978	4.125
1979	4.201
1980	4.341
1981	4.201
1982	3.947
1983	3.603
1984	3.57
1985	3.447
1986	3.373
1987	3.294
1988	3.264
1989	3.193
1990	3.119
1991	2.825
1992	2.562
1993	2.326
1994	2.113
1995	1.922
1996	1.75
1997	1.59
1998	1.443
1999	1.31
2000	1.188