Year Kilotonnes
1850 0
1851 0.00004
1852 0.00008
1853 0.00012
1854 0.00016
1855 0.0002
1856 0.00024
1857 0.00029
1858 0.00033
1859 0.00037
1860 0.00041
1861 0.00045
1862 0.00048
1863 0.00052
1864 0.00056
1865 0.0006
1866 0.00063
1867 0.00067
1868 0.00071
1869 0.00074
1870 0.00078
1871 0.00089
1872 0.00099
1873 0.0011
1874 0.00121
1875 0.00146
1876 0.00159
1877 0.00171
1878 0.00189
1879 0.00207
1880 0.00217
1881 0.00434
1882 0.00652
1883 0.00869
1884 0.01087
1885 0.01305
1886 0.01523
1887 0.01741
1888 0.01959
1889 0.02178
1890 0.02396
1891 0.03196
1892 0.2838
1893 0.4797
1894 0.6304
1895 0.9448
1896 1.071
1897 1.551
1898 1.704
1899 1.378
1900 1.607
1901 2.236
1902 1.628
1903 2.878
1904 3.219
1905 3.988
1906 4.378
1907 5.131
1908 5.344
1909 5.875
1910 6.07
1911 6.69
1912 6.328
1913 6.181
1914 6.497
1915 6.608
1916 7.442
1917 7.785
1918 7.963
1919 9.342
1920 10.46
1921 10.91
1922 10.28
1923 11.91
1924 13.41
1925 13.49
1926 17.5
1927 19.4
1928 21.19
1929 23.67
1930 24.13
1931 18.92
1932 18.02
1933 19.22
1934 20.41
1935 20.8
1936 21.08
1937 24.11
1938 34.64
1939 39.48
1940 42.47
1941 41.68
1942 31.7
1943 39.28
1944 27.89
1945 20.28
1946 16.85
1947 18.01
1948 25.99
1949 29.11
1950 64.42
1951 46.44
1952 72.96
1953 78.96
1954 73.08
1955 80.5
1956 76.01
1957 80.31
1958 58.84
1959 51.61
1960 45.79
1961 46.99
1962 35.76
1963 33.49
1964 16.34
1965 19.58
1966 18.87
1967 19.85
1968 22.53
1969 22.23
1970 33.86
1971 54.61
1972 76.84
1973 95.64
1974 108.4
1975 103.1
1976 103.5
1977 122.1
1978 120.9
1979 141.6
1980 177.1
1981 164.3
1982 158.2
1983 157.4
1984 185.2
1985 193.6
1986 199.1
1987 215.7
1988 224
1989 235.6
1990 280.9
1991 310.5
1992 316.1
1993 343.9
1994 323.9
1995 341.8
1996 366.6
1997 495.2
1998 457.4
1999 426.5
2000 417.9