Year	Kilotonnes
1850	418.5
1851	451.7
1852	483.5
1853	514.5
1854	545.5
1855	545
1856	559.7
1857	536.3
1858	533
1859	590.7
1860	659.7
1861	686.9
1862	665.7
1863	706.7
1864	758.8
1865	802.6
1866	826.3
1867	847.8
1868	832.9
1869	872
1870	890
1871	941.4
1872	990.4
1873	1042
1874	1012
1875	1067
1876	1059
1877	1068
1878	1053
1879	1056
1880	1155
1881	1214
1882	1228
1883	1279
1884	1250
1885	1238
1886	1231
1887	1266
1888	1321
1889	1372
1890	1408
1891	1440
1892	1413
1893	1268
1894	1455
1895	1471
1896	1516
1897	1559
1898	1564
1899	1678
1900	1702
1901	1670
1902	1739
1903	1758
1904	1771
1905	1800
1906	1872
1907	1963
1908	1922
1909	1946
1910	1970
1911	2030
1912	1936
1913	2132
1914	2079
1915	2120
1916	2213
1917	2207
1918	2073
1919	2043
1920	2122
1921	1463
1922	1979
1923	2124
1924	2250
1925	2134
1926	1201
1927	2262
1928	2134
1929	2271
1930	2195
1931	2066
1932	2004
1933	2000
1934	2174
1935	2219
1936	2336
1937	2402
1938	2291
1939	2321
1940	2429
1941	2433
1942	2479
1943	2454
1944	2441
1945	2354
1946	2410
1947	2504
1948	2508
1949	2536
1950	2551
1951	2843
1952	2923
1953	2956
1954	3049
1955	3187
1956	3220
1957	3250
1958	3239
1959	3189
1960	3076
1961	3144
1962	3372
1963	3409
1964	3535
1965	3598
1966	3450
1967	3520
1968	3455
1969	3271
1970	3212
1971	3019
1972	2946
1973	2995
1974	2777
1975	2684
1976	2564
1977	2540
1978	2612
1979	2756
1980	2427
1981	2199
1982	2093
1983	1923
1984	1849
1985	1859
1986	1939
1987	1937
1988	1905
1989	1848
1990	1861
1991	1768
1992	1732
1993	1558
1994	1338
1995	1182
1996	1014
1997	835
1998	804
1999	615
2000	595