Year Kilotonnes
1850 0.00002
1851 0.00002
1852 0.00004
1853 0.00006
1854 0.00008
1855 0.0001
1856 0.00012
1857 0.00014
1858 0.00016
1859 0.00019
1860 0.00021
1861 0.00041
1862 0.00061
1863 0.00082
1864 0.00102
1865 0.00122
1866 0.00143
1867 0.00163
1868 0.00184
1869 0.00204
1870 0.00225
1871 0.00245
1872 0.00266
1873 0.00287
1874 0.00309
1875 0.0033
1876 0.00351
1877 0.00372
1878 0.00394
1879 0.00415
1880 0.00436
1881 0.00494
1882 0.0046
1883 0.00463
1884 0.00466
1885 0.00513
1886 0.0056
1887 0.00607
1888 0.00656
1889 0.00729
1890 0.0077
1891 0.00649
1892 0.00837
1893 0.00731
1894 0.00909
1895 0.00803
1896 0.00903
1897 0.01017
1898 0.01052
1899 0.01061
1900 0.01268
1901 0.01381
1902 0.02762
1903 0.04143
1904 0.05523
1905 0.06904
1906 0.08285
1907 0.09666
1908 0.1105
1909 0.1243
1910 0.1381
1911 1.989
1912 5.674
1913 14.86
1914 20.37
1915 25.91
1916 42.43
1917 52.1
1918 38.07
1919 43.96
1920 36.32
1921 58.46
1922 79.8
1923 106.6
1924 156.4
1925 163
1926 145.3
1927 157.1
1928 198.1
1929 226.4
1930 242.4
1931 206.8
1932 93.33
1933 115
1934 186.5
1935 182
1936 164.5
1937 252.9
1938 208
1939 205.5
1940 245.8
1941 265.7
1942 268.6
1943 253.7
1944 263.5
1945 254.6
1946 230.5
1947 240.1
1948 245.6
1949 224.9
1950 274.8
1951 297.9
1952 318.7
1953 330.8
1954 335.6
1955 347.7
1956 369.9
1957 353.9
1958 401.2
1959 415
1960 405.2
1961 400.3
1962 360.9
1963 364.8
1964 376.6
1965 408.7
1966 406
1967 407.6
1968 498
1969 439.8
1970 459.5
1971 475.5
1972 460.3
1973 507.5
1974 533.6
1975 461.8
1976 368.2
1977 384.3
1978 351.7
1979 358
1980 340.9
1981 323.9
1982 296.7
1983 332.2
1984 305.4
1985 294.7
1986 280
1987 277.4
1988 283.3
1989 265.9
1990 247.4
1991 200.4
1992 156.9
1993 164.7
1994 163
1995 176.1
1996 183.6
1997 161.1
1998 166.8
1999 168.7
2000 153.5