Year	Kilotonnes
1850	0
1851	0.00837
1852	0.01673
1853	0.0251
1854	0.03346
1855	0.04183
1856	0.05019
1857	0.05856
1858	0.06693
1859	0.07529
1860	0.08366
1861	0.0916
1862	0.09947
1863	0.1073
1864	0.115
1865	0.1226
1866	0.1302
1867	0.1376
1868	0.145
1869	0.1524
1870	0.1596
1871	0.1853
1872	0.2109
1873	0.2364
1874	0.2619
1875	0.2873
1876	0.3127
1877	0.338
1878	0.3632
1879	0.3884
1880	0.4146
1881	0.4359
1882	0.4569
1883	0.4776
1884	0.498
1885	0.5181
1886	0.5379
1887	0.5573
1888	0.5765
1889	0.5956
1890	0.6142
1891	0.6415
1892	0.6768
1893	0.6802
1894	0.724
1895	0.8456
1896	0.8995
1897	0.9325
1898	1.023
1899	1.105
1900	1.288
1901	1.372
1902	1.512
1903	1.519
1904	1.659
1905	1.699
1906	1.937
1907	2.177
1908	2.462
1909	2.314
1910	2.369
1911	2.511
1912	3.036
1913	3.275
1914	3.297
1915	3.388
1916	3.393
1917	3.536
1918	3.949
1919	5.113
1920	3.429
1921	3.667
1922	3.62
1923	3.736
1924	4.003
1925	4.002
1926	4.085
1927	4.373
1928	4.443
1929	4.517
1930	4.647
1931	4.209
1932	3.923
1933	3.909
1934	4.324
1935	4.539
1936	4.429
1937	4.814
1938	5.354
1939	5.275
1940	5.54
1941	5.515
1942	5.491
1943	4.787
1944	4.876
1945	5.389
1946	5.502
1947	5.554
1948	0.1993
1949	12.09
1950	33.27
1951	43.53
1952	45.83
1953	42.66
1954	39.7
1955	38.75
1956	49.67
1957	43.71
1958	47.07
1959	44.43
1960	54.94
1961	56.4
1962	63.79
1963	85.81
1964	84.49
1965	84.78
1966	78.36
1967	82
1968	88.49
1969	91.59
1970	85.87
1971	77.2
1972	81.18
1973	80.27
1974	55.04
1975	93.24
1976	98.22
1977	109.4
1978	111.2
1979	95.08
1980	129.5
1981	132.2
1982	118.7
1983	78.72
1984	64.42
1985	65.35
1986	59.05
1987	54.35
1988	51.4
1989	50.75
1990	49.85
1991	51.55
1992	54.6
1993	62.3
1994	65.85
1995	69.7
1996	74.1
1997	72.35
1998	63.53
1999	57.73
2000	65.56