Year	Kilotonnes
1850	0.1314
1851	0.1473
1852	0.2944
1853	0.4398
1854	0.5836
1855	0.73
1856	0.8874
1857	1.043
1858	1.182
1859	1.333
1860	1.479
1861	1.745
1862	1.764
1863	1.866
1864	2.033
1865	2.064
1866	2.304
1867	2.619
1868	2.166
1869	2.986
1870	3.289
1871	4.441
1872	4.611
1873	4.343
1874	5.119
1875	6.093
1876	7.438
1877	7.421
1878	9.858
1879	10.13
1880	11.82
1881	12.41
1882	13.19
1883	14.93
1884	14.62
1885	15.67
1886	16.32
1887	16.09
1888	18.47
1889	21.69
1890	21.08
1891	22.39
1892	24.02
1893	27.23
1894	29.92
1895	32.79
1896	33.86
1897	39
1898	43.77
1899	51.49
1900	58.45
1901	59.1
1902	57.82
1903	60.69
1904	66.4
1905	60.68
1906	69.12
1907	79.52
1908	80.88
1909	83.92
1910	81.6
1911	89.07
1912	97.06
1913	112.4
1914	93.75
1915	83.88
1916	92.19
1917	83.1
1918	33.78
1919	25.85
1920	23.58
1921	25.84
1922	32.01
1923	35.66
1924	44.69
1925	45.71
1926	68.96
1927	87.26
1928	97.12
1929	111.1
1930	135.5
1931	161.1
1932	177.3
1933	204.7
1934	250.5
1935	290.3
1936	338
1937	347.5
1938	368.9
1939	404
1940	454.6
1941	448
1942	441.7
1943	435.4
1944	428.7
1945	422.2
1946	463.4
1947	514.4
1948	579.3
1949	644.5
1950	709
1951	763.2
1952	813.1
1953	857.4
1954	931.6
1955	1043
1956	1136
1957	1209
1958	1258
1959	1281
1960	1299
1961	1288
1962	1321
1963	1343
1964	1390
1965	1454
1966	1483
1967	1520
1968	1528
1969	1561
1970	1609
1971	1645
1972	1688
1973	1734
1974	1796
1975	1850
1976	1858
1977	1904
1978	1922
1979	1911
1980	1924
1981	1746
1982	1714
1983	1749
1984	1735
1985	1732
1986	1696
1987	1632
1988	1606
1989	1536
1990	1891
1991	1269
1992	1188
1993	1097
1994	857.5
1995	819.5
1996	646.5
1997	566
1998	511.5
1999	514.5
2000	514.5