Year Kilotonnes
1850 0.00441
1851 0.00495
1852 0.0099
1853 0.01478
1854 0.01962
1855 0.02454
1856 0.02983
1857 0.03507
1858 0.03974
1859 0.0448
1860 0.04973
1861 0.05866
1862 0.0593
1863 0.06271
1864 0.06834
1865 0.06939
1866 0.07746
1867 0.08803
1868 0.07281
1869 0.1004
1870 0.1105
1871 0.1493
1872 0.155
1873 0.146
1874 0.1721
1875 0.2048
1876 0.25
1877 0.2495
1878 0.3314
1879 0.3406
1880 0.3974
1881 0.4172
1882 0.4432
1883 0.5019
1884 0.4915
1885 0.5267
1886 0.5487
1887 0.5409
1888 0.6209
1889 0.7291
1890 0.7085
1891 0.7526
1892 0.8074
1893 0.9154
1894 1.006
1895 1.102
1896 1.138
1897 1.311
1898 1.471
1899 1.731
1900 1.965
1901 1.987
1902 1.943
1903 2.04
1904 2.232
1905 2.04
1906 2.324
1907 2.673
1908 2.719
1909 2.821
1910 2.743
1911 2.994
1912 3.262
1913 3.778
1914 3.151
1915 2.819
1916 3.099
1917 2.793
1918 1.135
1919 0.869
1920 0.7926
1921 0.8685
1922 1.076
1923 1.199
1924 1.502
1925 1.537
1926 2.318
1927 2.933
1928 3.264
1929 3.735
1930 4.556
1931 5.417
1932 5.961
1933 6.882
1934 8.42
1935 9.757
1936 11.36
1937 11.68
1938 12.4
1939 13.58
1940 15.28
1941 15.06
1942 14.85
1943 14.63
1944 14.41
1945 14.19
1946 15.58
1947 17.29
1948 19.47
1949 21.66
1950 23.83
1951 25.65
1952 27.33
1953 28.82
1954 31.31
1955 35.06
1956 38.17
1957 40.64
1958 42.3
1959 43.07
1960 43.67
1961 43.3
1962 44.39
1963 45.14
1964 46.72
1965 48.89
1966 49.86
1967 51.1
1968 51.37
1969 52.48
1970 54.07
1971 55.29
1972 56.73
1973 58.27
1974 60.38
1975 62.19
1976 62.46
1977 63.99
1978 64.61
1979 64.24
1980 64.69
1981 60.32
1982 61.9
1983 59.82
1984 61.45
1985 75.65
1986 81.67
1987 84.16
1988 91.32
1989 86.24
1990 83.07
1991 72.6
1992 83.97
1993 51.68
1994 38.23
1995 32.58
1996 27.24
1997 20.93
1998 20.94
1999 22.91
2000 25.15