Year Kilotonnes
1850 0
1851 0.00001
1852 0.00002
1853 0.00003
1854 0.00005
1855 0.00006
1856 0.00007
1857 0.00008
1858 0.00009
1859 0.0001
1860 0.00012
1861 0.00013
1862 0.00014
1863 0.00015
1864 0.00016
1865 0.00017
1866 0.00019
1867 0.0002
1868 0.00021
1869 0.00022
1870 0.00023
1871 0.00024
1872 0.00026
1873 0.00027
1874 0.00028
1875 0.00029
1876 0.0003
1877 0.00031
1878 0.00033
1879 0.00034
1880 0.00035
1881 0.00054
1882 0.00073
1883 0.00092
1884 0.00111
1885 0.0013
1886 0.00149
1887 0.00168
1888 0.00187
1889 0.00206
1890 0.00225
1891 0.00236
1892 0.00244
1893 0.00249
1894 0.0025
1895 0.00248
1896 0.00354
1897 0.00459
1898 0.00563
1899 0.00676
1900 0.00785
1901 0.00942
1902 0.01884
1903 0.02827
1904 0.03769
1905 0.04711
1906 0.05653
1907 0.06595
1908 0.07538
1909 0.0848
1910 0.09422
1911 0.8794
1912 0.4083
1913 3.141
1914 0.9422
1915 1.822
1916 4.303
1917 8.857
1918 10.68
1919 7.035
1920 4.648
1921 5.747
1922 5.433
1923 4.805
1924 5.119
1925 5.653
1926 5.433
1927 5.81
1928 8.417
1929 8.543
1930 8.951
1931 9.077
1932 8.511
1933 7.475
1934 6.941
1935 5.716
1936 5.747
1937 5.371
1938 7.098
1939 20.92
1940 29.18
1941 38.31
1942 37.05
1943 44.39
1944 46.58
1945 46.15
1946 43.03
1947 44.58
1948 62.36
1949 73.81
1950 77.95
1951 79.93
1952 76.32
1953 72.91
1954 73.64
1955 67.33
1956 59.38
1957 69.02
1958 70.48
1959 66.83
1960 78.74
1961 76.04
1962 81.31
1963 93.01
1964 116.9
1965 127.2
1966 117
1967 103.1
1968 102.7
1969 57.93
1970 52.02
1971 70.71
1972 87.73
1973 86.91
1974 107.3
1975 145.6
1976 158.7
1977 202.7
1978 202.4
1979 209.4
1980 244.3
1981 267.6
1982 277.3
1983 247.9
1984 272.6
1985 279.6
1986 283.4
1987 312.6
1988 307.9
1989 298.9
1990 301.7
1991 297.6
1992 280.9
1993 295.2
1994 284.2
1995 271.7
1996 271.4
1997 260.1
1998 253.4
1999 242
2000 227.6