Year	Kilotonnes
1850	0.259
1851	0.2809
1852	0.3085
1853	0.3267
1854	0.3521
1855	0.3635
1856	0.3796
1857	0.373
1858	0.379
1859	0.4108
1860	0.4551
1861	0.4794
1862	0.4853
1863	0.5063
1864	0.5433
1865	0.5747
1866	0.5955
1867	0.6218
1868	0.6323
1869	0.6671
1870	0.6707
1871	0.6984
1872	0.7706
1873	0.8124
1874	0.7873
1875	0.826
1876	0.8441
1877	0.8618
1878	0.8687
1879	0.8892
1880	0.9842
1881	1.041
1882	1.083
1883	1.137
1884	1.116
1885	1.126
1886	1.098
1887	1.156
1888	1.199
1889	1.267
1890	1.328
1891	1.361
1892	1.338
1893	1.286
1894	1.39
1895	1.423
1896	1.502
1897	1.546
1898	1.567
1899	1.67
1900	1.739
1901	1.733
1902	1.752
1903	1.807
1904	1.849
1905	1.884
1906	2.002
1907	2.109
1908	2.115
1909	2.144
1910	2.225
1911	2.262
1912	2.348
1913	2.429
1914	2.2
1915	2.242
1916	2.43
1917	2.362
1918	2.221
1919	1.973
1920	2.055
1921	1.844
1922	2.006
1923	2.027
1924	2.316
1925	2.311
1926	1.852
1927	2.519
1928	2.513
1929	2.756
1930	2.592
1931	2.351
1932	2.171
1933	2.22
1934	2.399
1935	2.501
1936	2.62
1937	2.86
1938	2.843
1939	2.984
1940	2.88
1941	3.023
1942	3.269
1943	3.575
1944	3.472
1945	1.806
1946	2.651
1947	2.882
1948	2.991
1949	3.069
1950	2.904
1951	2.588
1952	1.106
1953	0.6362
1954	0.432
1955	0.5531
1956	0.4681
1957	0.5554
1958	0.2104
1959	0.09369
1960	0.09291
1961	0.07868
1962	0.02647
1963	0.04136
1964	0.02711
1965	0.02684
1966	0.02643
1967	0.01303
1968	0.0128
1969	0.04276
1970	0.07273
1971	0.1027
1972	0.1327
1973	0.1626
1974	0.1926
1975	0.2225
1976	0.2525
1977	0.2825
1978	0.3124
1979	0.3424
1980	0.3724
1981	0.4023
1982	0.4323
1983	0.4623
1984	0.4922
1985	0.5222
1986	0.5522
1987	0.5821
1988	0.6121
1989	0.642
1990	0.672
1991	0.7774
1992	0.8994
1993	1.04
1994	1.204
1995	1.392
1996	1.611
1997	1.863
1998	2.156
1999	2.494
2000	2.885