Year	Kilotonnes
1850	0.00006
1851	0.00006
1852	0.00012
1853	0.00017
1854	0.00023
1855	0.00029
1856	0.00035
1857	0.00041
1858	0.00047
1859	0.00053
1860	0.00058
1861	0.00116
1862	0.00174
1863	0.00231
1864	0.00289
1865	0.00347
1866	0.00404
1867	0.00462
1868	0.0052
1869	0.00578
1870	0.00635
1871	0.00693
1872	0.00753
1873	0.00813
1874	0.00873
1875	0.00933
1876	0.00993
1877	0.01054
1878	0.01114
1879	0.01174
1880	0.01234
1881	0.01397
1882	0.01303
1883	0.01311
1884	0.0132
1885	0.01452
1886	0.01585
1887	0.01717
1888	0.01855
1889	0.02062
1890	0.0218
1891	0.01837
1892	0.0237
1893	0.0207
1894	0.02573
1895	0.02272
1896	0.02555
1897	0.02879
1898	0.02977
1899	0.03003
1900	0.03588
1901	0.03908
1902	0.07816
1903	0.1172
1904	0.1563
1905	0.1954
1906	0.2345
1907	0.2735
1908	0.3126
1909	0.3517
1910	0.3908
1911	0.4299
1912	0.4689
1913	0.508
1914	0.5471
1915	0.5862
1916	0.6252
1917	0.6643
1918	0.7034
1919	0.7425
1920	0.7816
1921	0.8206
1922	0.8597
1923	0.8988
1924	0.9379
1925	0.9769
1926	1.016
1927	1.055
1928	1.094
1929	1.133
1930	1.172
1931	1.211
1932	9.065
1933	6.468
1934	3.903
1935	3.926
1936	3.95
1937	3.973
1938	3.997
1939	4.02
1940	4.044
1941	4.056
1942	6.498
1943	6.482
1944	4.083
1945	4.088
1946	4.068
1947	4.063
1948	15.45
1949	24.32
1950	39.31
1951	43.99
1952	46.61
1953	39.59
1954	38.05
1955	37.86
1956	32.04
1957	35.16
1958	35.69
1959	34.41
1960	43
1961	37.8
1962	72.74
1963	85.54
1964	92.25
1965	89.73
1966	100.7
1967	85.58
1968	96.02
1969	99.7
1970	134.5
1971	133.5
1972	128.4
1973	141.1
1974	134.9
1975	77.43
1976	64.23
1977	68.94
1978	68.52
1979	70.85
1980	77.18
1981	67.78
1982	62.49
1983	62.61
1984	66.08
1985	69.75
1986	67.48
1987	66.2
1988	63.58
1989	62.54
1990	64.03
1991	64.62
1992	66.58
1993	62.57
1994	69.54
1995	64.87
1996	62.33
1997	61.4
1998	60.6
1999	59.04
2000	49.56