Year	Kilotonnes
1850	0
1851	0.00673
1852	0.01347
1853	0.0202
1854	0.02693
1855	0.03367
1856	0.04044
1857	0.04719
1858	0.05395
1859	0.06072
1860	0.06749
1861	0.07427
1862	0.08105
1863	0.08784
1864	0.09463
1865	0.1014
1866	0.1082
1867	0.115
1868	0.1218
1869	0.1287
1870	0.1355
1871	0.1423
1872	0.1491
1873	0.156
1874	0.1628
1875	0.1697
1876	0.1765
1877	0.1834
1878	0.1902
1879	0.1971
1880	0.204
1881	0.2108
1882	0.2177
1883	0.2246
1884	0.2315
1885	0.2384
1886	0.2453
1887	0.2522
1888	0.2591
1889	0.266
1890	0.273
1891	0.2799
1892	0.2868
1893	0.2938
1894	0.3007
1895	0.3076
1896	0.3146
1897	0.3215
1898	0.3285
1899	0.3355
1900	0.3424
1901	0.3494
1902	0.3564
1903	0.3634
1904	0.3704
1905	0.3774
1906	0.3844
1907	0.3914
1908	0.3984
1909	0.4054
1910	0.4124
1911	0.4195
1912	0.4265
1913	0.4335
1914	0.4406
1915	0.4407
1916	0.5039
1917	0.6301
1918	0.5673
1919	0.2522
1920	0.5677
1921	0.631
1922	0.8887
1923	1.331
1924	1.084
1925	1.021
1926	20.08
1927	17.95
1928	14.47
1929	15.85
1930	12.02
1931	9.261
1932	3.449
1933	2.228
1934	3.002
1935	3.615
1936	7.366
1937	12.61
1938	16.4
1939	12.11
1940	11.64
1941	12.81
1942	16.04
1943	15.32
1944	16.04
1945	18.41
1946	19.42
1947	20.22
1948	21.34
1949	23.29
1950	51.55
1951	55.92
1952	64.5
1953	49.83
1954	52.02
1955	59.25
1956	61.85
1957	73.8
1958	69.35
1959	62.09
1960	59.19
1961	48.64
1962	38.84
1963	30.36
1964	36.69
1965	36.53
1966	22.71
1967	18.92
1968	22.01
1969	25.81
1970	21.82
1971	25.89
1972	22.45
1973	22.91
1974	21.48
1975	18.03
1976	16.7
1977	19.64
1978	31.29
1979	29.77
1980	76.78
1981	87.82
1982	99.38
1983	120.4
1984	154.5
1985	131.9
1986	105.1
1987	109.5
1988	108.7
1989	108
1990	111.9
1991	122.2
1992	129.6
1993	134.8
1994	135.3
1995	145.1
1996	142.5
1997	160.2
1998	170.8
1999	193.3
2000	210.4