Year	Kilotonnes
1850	0.07179
1851	0.04789
1852	0.0901
1853	0.08111
1854	0.1006
1855	0.09726
1856	0.1338
1857	0.1532
1858	0.1613
1859	0.1523
1860	0.2173
1861	0.2139
1862	0.239
1863	0.2129
1864	0.2721
1865	0.2687
1866	0.2255
1867	0.2847
1868	0.2756
1869	0.3348
1870	0.2973
1871	0.2711
1872	0.3302
1873	0.2931
1874	0.3299
1875	0.3326
1876	0.3578
1877	0.3147
1878	0.3399
1879	0.3309
1880	0.2993
1881	0.3027
1882	0.3331
1883	0.248
1884	0.3292
1885	0.3042
1886	0.2838
1887	0.241
1888	0.2941
1889	0.2354
1890	0.2574
1891	0.2399
1892	0.2734
1893	0.304
1894	0.3166
1895	0.3202
1896	0.3245
1897	0.3267
1898	0.3945
1899	0.4311
1900	0.47
1901	0.6149
1902	1.247
1903	1.894
1904	2.541
1905	3.179
1906	3.731
1907	4.315
1908	5.094
1909	5.753
1910	6.404
1911	6.866
1912	12.81
1913	20.09
1914	22.93
1915	25.01
1916	27.6
1917	34.94
1918	37.32
1919	42.56
1920	49.32
1921	51.81
1922	53.34
1923	51.2
1924	51.23
1925	48.38
1926	44.31
1927	37.66
1928	88.41
1929	107.4
1930	132.5
1931	109
1932	104.9
1933	110.1
1934	122.1
1935	138.3
1936	149.7
1937	180.6
1938	182.8
1939	178.7
1940	149.1
1941	191.2
1942	105.7
1943	172.8
1944	227.9
1945	272.1
1946	299.2
1947	339.7
1948	357.5
1949	380.1
1950	408.3
1951	449.5
1952	424.2
1953	386.3
1954	396.9
1955	388.9
1956	366.7
1957	310.3
1958	266.3
1959	271.9
1960	257.1
1961	248
1962	229.8
1963	223.3
1964	214.7
1965	199.1
1966	185.2
1967	198.5
1968	188.5
1969	184.5
1970	204.4
1971	167.5
1972	156.5
1973	178.7
1974	182.8
1975	110.6
1976	139
1977	121.3
1978	117
1979	105.3
1980	143.6
1981	116.5
1982	95.47
1983	74.53
1984	65.68
1985	28.63
1986	26.67
1987	32.3
1988	34.28
1989	34.76
1990	37.48
1991	38.16
1992	38.89
1993	39.67
1994	40.45
1995	41.24
1996	42.05
1997	42.86
1998	43.68
1999	44.49
2000	45.31