Year	Kilotonnes
1850	0.00003
1851	0.00004
1852	0.00005
1853	0.00005
1854	0.00006
1855	0.00007
1856	0.00008
1857	0.00009
1858	0.00015
1859	0.00018
1860	0.00035
1861	0.00071
1862	0.00094
1863	0.00115
1864	0.00136
1865	0.00159
1866	0.00174
1867	0.0231
1868	0.0443
1869	0.06545
1870	0.08766
1871	0.109
1872	0.1301
1873	0.1515
1874	0.1726
1875	0.194
1876	0.2152
1877	0.2366
1878	0.2575
1879	0.2787
1880	0.3002
1881	0.3479
1882	0.627
1883	0.932
1884	1.034
1885	1.064
1886	1.19
1887	1.323
1888	1.532
1889	1.586
1890	1.862
1891	2.303
1892	2.213
1893	2.407
1894	2.35
1895	2.394
1896	2.698
1897	3.177
1898	3.754
1899	3.733
1900	3.192
1901	4.133
1902	4.213
1903	4.623
1904	5.233
1905	5.852
1906	6.41
1907	8.668
1908	8.664
1909	9.122
1910	10.11
1911	11.39
1912	13
1913	14.47
1914	14
1915	14.36
1916	12.45
1917	16.19
1918	18.88
1919	20.8
1920	18.62
1921	20.94
1922	24.33
1923	37.47
1924	33.32
1925	35.65
1926	38.2
1927	40.75
1928	39.69
1929	41.1
1930	35.38
1931	30.72
1932	28.43
1933	27.36
1934	32.47
1935	34.32
1936	38.05
1937	44.18
1938	57.99
1939	56.87
1940	65.44
1941	61.01
1942	64.44
1943	68.51
1944	56.76
1945	53.73
1946	52.74
1947	62.27
1948	71.45
1949	82.25
1950	60.65
1951	69.37
1952	81.9
1953	91.69
1954	98.5
1955	105.6
1956	113.3
1957	120.3
1958	121.7
1959	122.4
1960	122.6
1961	127.4
1962	138.4
1963	143.8
1964	151.3
1965	162.5
1966	177.6
1967	197.2
1968	222.1
1969	250.1
1970	298.7
1971	300.5
1972	338.4
1973	369.2
1974	408
1975	414.7
1976	397.5
1977	411.7
1978	455.1
1979	491.8
1980	527.5
1981	547.5
1982	552
1983	614.5
1984	611.5
1985	627.5
1986	646.5
1987	652.5
1988	734.5
1989	758.5
1990	655.5
1991	520.5
1992	475.5
1993	464
1994	456
1995	456
1996	456
1997	456
1998	456
1999	456
2000	456