Year Kilotonnes
1850 0
1851 0
1852 0
1853 0
1854 0
1855 0.00001
1856 0.00001
1857 0.00001
1858 0.00001
1859 0.00001
1860 0.00001
1861 0.00001
1862 0.00001
1863 0.00001
1864 0.00002
1865 0.00002
1866 0.00002
1867 0.00002
1868 0.00002
1869 0.00002
1870 0.00002
1871 0.00002
1872 0.00002
1873 0.00003
1874 0.00003
1875 0.00003
1876 0.00003
1877 0.00003
1878 0.00003
1879 0.00003
1880 0.00003
1881 0.00005
1882 0.00007
1883 0.00009
1884 0.00011
1885 0.00013
1886 0.00014
1887 0.00016
1888 0.00018
1889 0.0002
1890 0.00022
1891 0.00023
1892 0.00023
1893 0.00024
1894 0.00024
1895 0.00024
1896 0.00034
1897 0.00044
1898 0.00054
1899 0.00065
1900 0.00076
1901 0.00091
1902 0.00141
1903 0.00199
1904 0.0034
1905 0.0031
1906 0.00359
1907 0.00428
1908 0.00477
1909 0.00508
1910 0.00525
1911 0.00561
1912 0.00706
1913 0.00804
1914 0.0063
1915 0.00471
1916 0.00786
1917 0.00736
1918 0.00664
1919 0.00505
1920 0.00607
1921 0.00597
1922 0.00715
1923 0.00815
1924 0.0086
1925 0.00856
1926 0.01099
1927 0.01071
1928 0.0107
1929 0.01043
1930 0.00976
1931 0.00974
1932 0.01562
1933 0.02123
1934 0.01612
1935 0.01961
1936 0.0269
1937 0.03073
1938 0.2574
1939 2.07
1940 2.689
1941 2.264
1942 2.377
1943 2.485
1944 4.045
1945 10.88
1946 30.48
1947 45.28
1948 69.45
1949 83.48
1950 116.5
1951 128.7
1952 133.7
1953 157.9
1954 164.2
1955 150.8
1956 137.4
1957 125.2
1958 105.2
1959 107.6
1960 131.5
1961 137.7
1962 137.7
1963 149.2
1964 142.9
1965 161.8
1966 146.7
1967 181.6
1968 184.8
1969 187.7
1970 265.8
1971 248.8
1972 240.9
1973 241.8
1974 252.2
1975 216
1976 231.4
1977 280.7
1978 259.1
1979 312.4
1980 324.9
1981 359.2
1982 347.5
1983 402.2
1984 345.6
1985 390.5
1986 562.8
1987 582.1
1988 543.1
1989 544.9
1990 567.5
1991 500
1992 512.9
1993 450
1994 405.7
1995 358.6
1996 348
1997 284.9
1998 241.3
1999 221
2000 218.4