Year	Kilotonnes
1850	0.1056
1851	0.08469
1852	0.106
1853	0.04285
1854	0.02193
1855	0.02213
1856	0.0857
1857	0.0859
1858	0.0861
1859	0.0863
1860	0.1076
1861	0.1078
1862	0.1291
1863	0.1504
1864	0.1929
1865	0.1719
1866	0.2567
1867	0.3414
1868	0.3628
1869	0.3631
1870	0.1943
1871	0.2369
1872	0.2584
1873	0.2587
1874	0.238
1875	0.2383
1876	0.2383
1877	0.2594
1878	0.196
1879	0.2075
1880	0.219
1881	0.3912
1882	0.4405
1883	0.5205
1884	0.6234
1885	0.5681
1886	0.5158
1887	0.5
1888	0.5763
1889	0.6534
1890	0.661
1891	0.7855
1892	0.7244
1893	0.7787
1894	0.8339
1895	0.8905
1896	0.9782
1897	1.133
1898	1.262
1899	1.451
1900	1.528
1901	1.635
1902	1.566
1903	1.649
1904	1.766
1905	1.962
1906	2.067
1907	2.432
1908	2.453
1909	2.312
1910	2.685
1911	2.81
1912	2.992
1913	2.994
1914	2.755
1915	2.457
1916	2.311
1917	2.284
1918	2.346
1919	1.62
1920	1.967
1921	1.844
1922	1.996
1923	2.24
1924	2.236
1925	2.244
1926	2.206
1927	2.376
1928	2.286
1929	2.256
1930	2.184
1931	1.878
1932	2.041
1933	2.073
1934	2.139
1935	2.271
1936	2.46
1937	2.719
1938	2.805
1939	2.964
1940	2.953
1941	3.168
1942	3.164
1943	3.036
1944	3.042
1945	2.852
1946	2.914
1947	2.962
1948	3.059
1949	3.107
1950	3.357
1951	3.397
1952	3.694
1953	3.892
1954	4.377
1955	5.035
1956	5.674
1957	5.83
1958	6.202
1959	6.484
1960	6.994
1961	6.791
1962	7.068
1963	7.537
1964	7.523
1965	7.637
1966	8.024
1967	8.164
1968	8.416
1969	8.591
1970	8.685
1971	7.998
1972	8.431
1973	8.549
1974	9.16
1975	9.298
1976	9.886
1977	10.42
1978	10.04
1979	10.32
1980	9.864
1981	10.52
1982	11.55
1983	11.18
1984	10.48
1985	10.27
1986	10.04
1987	9.807
1988	10.01
1989	10.12
1990	10.1
1991	10.36
1992	11.68
1993	13.06
1994	12.58
1995	11.1
1996	11.3
1997	9.896
1998	8.88
1999	8.956
2000	8.117