Year	Kilotonnes
1850	0.0093
1851	0.01008
1852	0.02015
1853	0.03014
1854	0.04005
1855	0.05009
1856	0.06063
1857	0.0711
1858	0.08079
1859	0.09102
1860	0.1008
1861	0.1444
1862	0.1509
1863	0.1623
1864	0.1364
1865	0.1565
1866	0.171
1867	0.169
1868	0.2038
1869	0.1893
1870	0.2175
1871	0.247
1872	0.2279
1873	0.2294
1874	0.277
1875	0.2373
1876	0.2542
1877	0.2823
1878	0.3024
1879	0.2535
1880	0.2808
1881	0.285
1882	0.3144
1883	0.3125
1884	0.3487
1885	0.4364
1886	0.3411
1887	0.3435
1888	0.3343
1889	0.3818
1890	0.4364
1891	0.4398
1892	0.4083
1893	0.4036
1894	0.4293
1895	0.4364
1896	0.5468
1897	0.8656
1898	0.9108
1899	1.38
1900	1.309
1901	1.081
1902	1.107
1903	1.403
1904	1.528
1905	1.746
1906	2.109
1907	3.249
1908	5.494
1909	5.804
1910	5.674
1911	8.155
1912	10.97
1913	14.81
1914	8.873
1915	4.364
1916	4.96
1917	4.287
1918	4.682
1919	5.256
1920	5.237
1921	4.981
1922	8.199
1923	13.98
1924	15.21
1925	13.97
1926	12.27
1927	20.14
1928	22.13
1929	27.36
1930	23.57
1931	26.65
1932	27
1933	27.69
1934	33.79
1935	36.22
1936	40.47
1937	46.76
1938	38.73
1939	36.25
1940	26.19
1941	33.19
1942	33.44
1943	43.05
1944	34.02
1945	20.95
1946	37.52
1947	59.51
1948	89.17
1949	67.55
1950	62.85
1951	88.87
1952	91.32
1953	78.59
1954	81.31
1955	95.14
1956	103.3
1957	120
1958	118.7
1959	131.7
1960	141.4
1961	151.1
1962	162.6
1963	173.7
1964	189.6
1965	197.7
1966	177.7
1967	191.1
1968	203.1
1969	214.3
1970	257.5
1971	235.9
1972	228.1
1973	236.6
1974	267.4
1975	267.5
1976	245.6
1977	288.6
1978	260.6
1979	285.1
1980	292
1981	267
1982	242
1983	186
1984	184
1985	191
1986	165.5
1987	164
1988	151
1989	122
1990	118.5
1991	97
1992	70.5
1993	61
1994	57.5
1995	48.5
1996	52.5
1997	49.5
1998	44.5
1999	42.5
2000	38