Year	Kilotonnes
1850	0.01061
1851	0.01191
1852	0.02379
1853	0.03554
1854	0.04715
1855	0.05899
1856	0.0717
1857	0.0843
1858	0.09553
1859	0.1077
1860	0.1195
1861	0.141
1862	0.1425
1863	0.1508
1864	0.1643
1865	0.1668
1866	0.1862
1867	0.2116
1868	0.175
1869	0.2412
1870	0.2657
1871	0.3588
1872	0.3726
1873	0.3509
1874	0.4136
1875	0.4923
1876	0.601
1877	0.5996
1878	0.7965
1879	0.8188
1880	0.9552
1881	1.003
1882	1.065
1883	1.206
1884	1.182
1885	1.266
1886	1.319
1887	1.3
1888	1.492
1889	1.753
1890	1.703
1891	1.809
1892	1.941
1893	2.201
1894	2.418
1895	2.649
1896	2.736
1897	3.151
1898	3.537
1899	4.161
1900	4.722
1901	4.776
1902	4.672
1903	4.904
1904	5.365
1905	4.903
1906	5.585
1907	6.425
1908	6.535
1909	6.781
1910	6.593
1911	7.197
1912	7.842
1913	9.081
1914	7.575
1915	6.777
1916	7.449
1917	6.714
1918	2.729
1919	2.089
1920	1.905
1921	2.088
1922	2.586
1923	2.882
1924	3.611
1925	3.694
1926	5.572
1927	7.051
1928	7.847
1929	8.979
1930	10.95
1931	13.02
1932	14.33
1933	16.54
1934	20.24
1935	23.45
1936	27.31
1937	28.08
1938	29.81
1939	32.64
1940	36.73
1941	36.2
1942	35.69
1943	35.18
1944	34.64
1945	34.12
1946	37.44
1947	41.57
1948	46.81
1949	52.07
1950	57.28
1951	61.67
1952	65.69
1953	69.28
1954	75.27
1955	84.27
1956	91.75
1957	97.68
1958	101.7
1959	103.5
1960	105
1961	104.1
1962	106.7
1963	108.5
1964	112.3
1965	117.5
1966	119.9
1967	122.8
1968	123.5
1969	126.1
1970	130
1971	132.9
1972	136.4
1973	140.1
1974	145.1
1975	149.5
1976	150.1
1977	153.8
1978	155.3
1979	154.4
1980	155.5
1981	156
1982	152
1983	155
1984	151.5
1985	152
1986	158
1987	158
1988	150
1989	149
1990	111
1991	117
1992	69.5
1993	62.5
1994	58.5
1995	47
1996	46.5
1997	38.5
1998	47
1999	35
2000	21.55