Year Kilotonnes
1850 0
1851 0.00006
1852 0.00011
1853 0.00017
1854 0.00023
1855 0.00028
1856 0.00034
1857 0.0004
1858 0.00046
1859 0.00051
1860 0.00057
1861 0.00063
1862 0.00069
1863 0.00074
1864 0.0008
1865 0.00086
1866 0.00092
1867 0.00097
1868 0.00103
1869 0.00109
1870 0.00115
1871 0.0012
1872 0.00126
1873 0.00132
1874 0.00138
1875 0.00144
1876 0.00149
1877 0.00155
1878 0.00161
1879 0.00167
1880 0.00173
1881 0.00266
1882 0.0036
1883 0.00453
1884 0.00547
1885 0.00641
1886 0.00734
1887 0.00829
1888 0.00923
1889 0.01017
1890 0.01111
1891 0.01163
1892 0.01201
1893 0.01226
1894 0.01233
1895 0.01222
1896 0.01743
1897 0.02261
1898 0.02774
1899 0.03332
1900 0.03873
1901 0.04645
1902 0.09291
1903 0.1394
1904 0.1858
1905 0.2323
1906 0.2787
1907 0.3252
1908 0.3716
1909 0.4181
1910 0.4645
1911 0.511
1912 0.5575
1913 0.6039
1914 0.6504
1915 0.6968
1916 0.7433
1917 0.7897
1918 0.8362
1919 0.8826
1920 0.9291
1921 0.9755
1922 1.022
1923 1.068
1924 1.115
1925 1.161
1926 1.208
1927 1.254
1928 1.301
1929 1.347
1930 1.394
1931 1.44
1932 1.487
1933 1.533
1934 1.579
1935 1.626
1936 1.672
1937 1.719
1938 1.765
1939 1.812
1940 1.858
1941 1.903
1942 1.947
1943 1.988
1944 2.025
1945 2.061
1946 2.068
1947 2.092
1948 2.116
1949 2.129
1950 5.572
1951 9.015
1952 12.46
1953 15.9
1954 19.34
1955 56.38
1956 56.53
1957 49.1
1958 39.83
1959 42.9
1960 40.91
1961 47.47
1962 51.63
1963 51.22
1964 51.37
1965 48.28
1966 45.47
1967 39.4
1968 32.07
1969 39.04
1970 40.69
1971 21.53
1972 18.74
1973 17.43
1974 16.47
1975 9.268
1976 8.775
1977 11.52
1978 11.04
1979 11.36
1980 17.55
1981 15.62
1982 18.3
1983 16.53
1984 16.21
1985 15.89
1986 16.19
1987 17.3
1988 17.21
1989 16
1990 16.98
1991 16.31
1992 20.98
1993 16.56
1994 15.82
1995 18.27
1996 23.25
1997 26.98
1998 27.68
1999 30.19
2000 33.54