Year	Kilotonnes
1850	0
1851	0.01657
1852	0.03314
1853	0.0497
1854	0.06627
1855	0.08284
1856	0.09949
1857	0.1161
1858	0.1328
1859	0.1494
1860	0.1661
1861	0.1827
1862	0.1994
1863	0.2161
1864	0.2328
1865	0.2496
1866	0.2663
1867	0.283
1868	0.2998
1869	0.3166
1870	0.3334
1871	0.3502
1872	0.367
1873	0.3838
1874	0.4006
1875	0.4175
1876	0.4343
1877	0.4512
1878	0.4681
1879	0.485
1880	0.5019
1881	0.7736
1882	1.045
1883	1.318
1884	1.59
1885	1.862
1886	2.135
1887	2.408
1888	2.682
1889	2.956
1890	3.23
1891	3.379
1892	3.492
1893	3.563
1894	3.585
1895	3.551
1896	5.682
1897	7.813
1898	9.944
1899	12.07
1900	14.21
1901	17.06
1902	27.01
1903	40.5
1904	68.16
1905	60.36
1906	70.29
1907	83.74
1908	93.64
1909	100
1910	102.8
1911	109.2
1912	140.3
1913	157.2
1914	121.2
1915	85.23
1916	151.5
1917	133.2
1918	114.9
1919	82.53
1920	106.5
1921	98.57
1922	122.1
1923	138.4
1924	144.3
1925	139.9
1926	170.8
1927	161.9
1928	159.2
1929	148.8
1930	134
1931	135.4
1932	266.6
1933	385.9
1934	248.9
1935	264.4
1936	401.6
1937	460.5
1938	630.5
1939	617.6
1940	460.5
1941	473.2
1942	337.1
1943	187.1
1944	293.2
1945	298.5
1946	361.6
1947	455.6
1948	476.4
1949	519.8
1950	541
1951	602.9
1952	125.3
1953	96
1954	99.71
1955	91.34
1956	80.58
1957	97.97
1958	70.97
1959	61.1
1960	63.54
1961	63.09
1962	51.48
1963	69.55
1964	158.9
1965	167
1966	168.2
1967	145.3
1968	135.3
1969	152.9
1970	191.4
1971	187.7
1972	133.3
1973	155.5
1974	153
1975	92.4
1976	130.7
1977	128.4
1978	135.9
1979	184.4
1980	245.9
1981	215
1982	150.3
1983	164.7
1984	130.4
1985	126.1
1986	117.8
1987	140.1
1988	156.4
1989	87.62
1990	102.7
1991	92.56
1992	94.38
1993	96.28
1994	99.35
1995	107.8
1996	110.1
1997	110.5
1998	115.6
1999	110.3
2000	114.9