Year	Kilotonnes
1850	0.6495
1851	0.7044
1852	0.7735
1853	0.8192
1854	0.8829
1855	0.9115
1856	0.952
1857	0.9354
1858	0.9504
1859	1.03
1860	1.141
1861	1.202
1862	1.217
1863	1.27
1864	1.363
1865	1.441
1866	1.493
1867	1.559
1868	1.586
1869	1.673
1870	1.682
1871	1.751
1872	1.933
1873	2.037
1874	1.974
1875	2.071
1876	2.117
1877	2.161
1878	2.179
1879	2.23
1880	2.468
1881	2.612
1882	2.716
1883	2.852
1884	2.8
1885	2.825
1886	2.753
1887	2.898
1888	3.008
1889	3.177
1890	3.33
1891	3.413
1892	3.356
1893	3.225
1894	3.485
1895	3.568
1896	3.767
1897	3.876
1898	3.929
1899	4.189
1900	4.362
1901	4.345
1902	4.394
1903	4.532
1904	4.637
1905	4.725
1906	5.021
1907	5.288
1908	5.304
1909	5.378
1910	5.581
1911	5.673
1912	5.887
1913	6.092
1914	5.517
1915	5.622
1916	6.095
1917	5.923
1918	5.57
1919	4.947
1920	5.153
1921	4.625
1922	5.031
1923	5.083
1924	5.808
1925	5.796
1926	4.645
1927	6.317
1928	6.303
1929	6.911
1930	6.5
1931	5.896
1932	5.445
1933	5.568
1934	6.015
1935	6.272
1936	6.571
1937	7.172
1938	7.13
1939	7.482
1940	7.222
1941	7.582
1942	8.199
1943	8.965
1944	8.707
1945	4.529
1946	6.649
1947	7.228
1948	7.5
1949	7.697
1950	7.282
1951	6.453
1952	6.122
1953	5.062
1954	4.882
1955	8.091
1956	8.137
1957	8.689
1958	9.426
1959	11.05
1960	11.33
1961	11.28
1962	13.97
1963	13.05
1964	19.78
1965	13.75
1966	13.13
1967	17.57
1968	14.06
1969	12.81
1970	8.9
1971	4.987
1972	2.896
1973	1.65
1974	9.663
1975	7.282
1976	9.555
1977	8.366
1978	8.827
1979	9.537
1980	8.9
1981	8.9
1982	8.9
1983	9.1
1984	9.4
1985	9.05
1986	9.2
1987	8.1
1988	8.75
1989	8.65
1990	4.1
1991	3.65
1992	4.1
1993	4.35
1994	4
1995	4.05
1996	4.15
1997	4.4
1998	4.2
1999	4.4
2000	4.45