Year	Kilotonnes
1850	0
1851	0.00002
1852	0.00005
1853	0.00007
1854	0.0001
1855	0.00012
1856	0.00015
1857	0.00017
1858	0.0002
1859	0.00022
1860	0.00025
1861	0.00027
1862	0.0003
1863	0.00032
1864	0.00035
1865	0.00037
1866	0.0004
1867	0.00042
1868	0.00045
1869	0.00047
1870	0.0005
1871	0.00052
1872	0.00055
1873	0.00057
1874	0.0006
1875	0.00062
1876	0.00065
1877	0.00067
1878	0.0007
1879	0.00072
1880	0.00075
1881	0.00115
1882	0.00156
1883	0.00196
1884	0.00237
1885	0.00278
1886	0.00318
1887	0.00359
1888	0.004
1889	0.00441
1890	0.00481
1891	0.00504
1892	0.00521
1893	0.00531
1894	0.00534
1895	0.00529
1896	0.00755
1897	0.0098
1898	0.01202
1899	0.01444
1900	0.01678
1901	0.02013
1902	0.04025
1903	0.06038
1904	0.08051
1905	0.1006
1906	0.1208
1907	0.1409
1908	0.161
1909	0.1811
1910	0.2013
1911	0.2214
1912	0.2415
1913	0.7548
1914	1.193
1915	1.449
1916	1.856
1917	3.035
1918	3.26
1919	2.963
1920	2.47
1921	7.194
1922	8.311
1923	12.04
1924	13.75
1925	14.85
1926	15.25
1927	17.05
1928	18.53
1929	18.67
1930	19.43
1931	20.74
1932	21.15
1933	23.19
1934	24.66
1935	24.59
1936	26.85
1937	32.97
1938	33.14
1939	31.34
1940	28.85
1941	22.58
1942	30.91
1943	31.43
1944	42.94
1945	54.84
1946	60.85
1947	64.25
1948	76.31
1949	81.32
1950	571.6
1951	392.4
1952	42.1
1953	39.68
1954	47.65
1955	161.8
1956	274.5
1957	349.6
1958	339.4
1959	315.9
1960	392
1961	311.4
1962	324.9
1963	335
1964	335.5
1965	330.1
1966	335
1967	371.3
1968	389.2
1969	400
1970	408.9
1971	410.6
1972	388.3
1973	427.3
1974	513
1975	527.9
1976	492.9
1977	597
1978	588.7
1979	579.7
1980	542.1
1981	494.1
1982	553.9
1983	480.4
1984	453.5
1985	605.7
1986	453
1987	435
1988	461.5
1989	523.2
1990	577.5
1991	586.1
1992	549
1993	596.2
1994	629.7
1995	616.8
1996	598.2
1997	542.1
1998	541
1999	502.4
2000	499