Year Kilotonnes
1850 0
1851 0.00002
1852 0.00005
1853 0.00007
1854 0.0001
1855 0.00012
1856 0.00015
1857 0.00017
1858 0.0002
1859 0.00022
1860 0.00025
1861 0.00027
1862 0.0003
1863 0.00032
1864 0.00035
1865 0.00037
1866 0.0004
1867 0.00042
1868 0.00045
1869 0.00047
1870 0.0005
1871 0.00052
1872 0.00055
1873 0.00057
1874 0.0006
1875 0.00062
1876 0.00065
1877 0.00067
1878 0.0007
1879 0.00072
1880 0.00075
1881 0.00115
1882 0.00156
1883 0.00196
1884 0.00237
1885 0.00278
1886 0.00318
1887 0.00359
1888 0.004
1889 0.00441
1890 0.00481
1891 0.00504
1892 0.00521
1893 0.00531
1894 0.00534
1895 0.00529
1896 0.00755
1897 0.0098
1898 0.01202
1899 0.01444
1900 0.01678
1901 0.02013
1902 0.04025
1903 0.06038
1904 0.08051
1905 0.1006
1906 0.1208
1907 0.1409
1908 0.161
1909 0.1811
1910 0.2013
1911 0.2214
1912 0.2415
1913 0.7548
1914 1.193
1915 1.449
1916 1.856
1917 3.035
1918 3.26
1919 2.963
1920 2.47
1921 7.194
1922 8.311
1923 12.04
1924 13.75
1925 14.85
1926 15.25
1927 17.05
1928 18.53
1929 18.67
1930 19.43
1931 20.74
1932 21.15
1933 23.19
1934 24.66
1935 24.59
1936 26.85
1937 32.97
1938 33.14
1939 31.34
1940 28.85
1941 22.58
1942 30.91
1943 31.43
1944 42.94
1945 54.84
1946 60.85
1947 64.25
1948 76.31
1949 81.32
1950 571.6
1951 392.4
1952 42.1
1953 39.68
1954 47.65
1955 161.8
1956 274.5
1957 349.6
1958 339.4
1959 315.9
1960 392
1961 311.4
1962 324.9
1963 335
1964 335.5
1965 330.1
1966 335
1967 371.3
1968 389.2
1969 400
1970 408.9
1971 410.6
1972 388.3
1973 427.3
1974 513
1975 527.9
1976 492.9
1977 597
1978 588.7
1979 579.7
1980 542.1
1981 494.1
1982 553.9
1983 480.4
1984 453.5
1985 605.7
1986 453
1987 435
1988 461.5
1989 523.2
1990 577.5
1991 586.1
1992 549
1993 596.2
1994 629.7
1995 616.8
1996 598.2
1997 542.1
1998 541
1999 502.4
2000 499