Year	Kilotonnes
1850	0
1851	0.00269
1852	0.00538
1853	0.00806
1854	0.01075
1855	0.01344
1856	0.01613
1857	0.01882
1858	0.0215
1859	0.02419
1860	0.02688
1861	0.02944
1862	0.03198
1863	0.03449
1864	0.03699
1865	0.03946
1866	0.0419
1867	0.04433
1868	0.04673
1869	0.0491
1870	0.05146
1871	0.05851
1872	0.06559
1873	0.07264
1874	0.07968
1875	0.09635
1876	0.1052
1877	0.1128
1878	0.125
1879	0.1366
1880	0.1432
1881	0.1489
1882	0.1571
1883	0.1694
1884	0.1883
1885	0.2075
1886	0.2077
1887	0.2268
1888	0.2486
1889	0.2791
1890	0.2991
1891	0.3273
1892	0.3474
1893	0.3383
1894	0.3861
1895	0.4199
1896	0.4443
1897	0.4583
1898	0.5261
1899	0.5603
1900	0.6192
1901	0.696
1902	0.7579
1903	0.7979
1904	0.839
1905	0.8935
1906	1.224
1907	1.308
1908	1.4
1909	1.412
1910	1.465
1911	1.567
1912	1.77
1913	2.004
1914	2.092
1915	2.075
1916	2.378
1917	2.585
1918	2.663
1919	2.972
1920	2.355
1921	2.503
1922	2.585
1923	2.804
1924	2.967
1925	3.005
1926	3.025
1927	3.186
1928	3.265
1929	3.351
1930	3.348
1931	3.158
1932	3.059
1933	3.26
1934	3.59
1935	3.816
1936	4.058
1937	4.187
1938	4.231
1939	4.574
1940	5.153
1941	5.47
1942	5.468
1943	5.229
1944	5.119
1945	3.18
1946	2.601
1947	2.939
1948	3.075
1949	4.056
1950	4.651
1951	4.874
1952	5.241
1953	3.299
1954	3.214
1955	4.137
1956	6.52
1957	4.525
1958	3.484
1959	3.418
1960	3.694
1961	3.883
1962	3.525
1963	3.243
1964	2.931
1965	2.848
1966	2.414
1967	1.859
1968	1.238
1969	0.7136
1970	0.3733
1971	0.4631
1972	0.3196
1973	0.271
1974	0.1625
1975	0.1446
1976	0.1922
1977	0.1576
1978	0.1082
1979	0.0878
1980	0.0468
1981	0.9348
1982	23.25
1983	49.92
1984	63.24
1985	77.75
1986	80.35
1987	74.3
1988	75.25
1989	82.4
1990	76.2
1991	89.15
1992	99.95
1993	103.1
1994	71
1995	77.3
1996	73.9
1997	70
1998	57.59
1999	36.19
2000	38.21