Year Kilotonnes
1850 0.0093
1851 0.01008
1852 0.02015
1853 0.03014
1854 0.04005
1855 0.05009
1856 0.06063
1857 0.0711
1858 0.08079
1859 0.09102
1860 0.1008
1861 0.1444
1862 0.1509
1863 0.1623
1864 0.1364
1865 0.1565
1866 0.171
1867 0.169
1868 0.2038
1869 0.1893
1870 0.2175
1871 0.247
1872 0.2279
1873 0.2294
1874 0.277
1875 0.2373
1876 0.2542
1877 0.2823
1878 0.3024
1879 0.2535
1880 0.2808
1881 0.285
1882 0.3144
1883 0.3125
1884 0.3487
1885 0.4364
1886 0.3411
1887 0.3435
1888 0.3343
1889 0.3818
1890 0.4364
1891 0.4398
1892 0.4083
1893 0.4036
1894 0.4293
1895 0.4364
1896 0.5468
1897 0.8656
1898 0.9108
1899 1.38
1900 1.309
1901 1.081
1902 1.107
1903 1.403
1904 1.528
1905 1.746
1906 2.109
1907 3.249
1908 5.494
1909 5.804
1910 5.674
1911 8.155
1912 10.97
1913 14.81
1914 8.873
1915 4.364
1916 4.96
1917 4.287
1918 4.682
1919 5.256
1920 5.237
1921 4.981
1922 8.199
1923 13.98
1924 15.21
1925 13.97
1926 12.27
1927 20.14
1928 22.13
1929 27.36
1930 23.57
1931 26.65
1932 27
1933 27.69
1934 33.79
1935 36.22
1936 40.47
1937 46.76
1938 38.73
1939 36.25
1940 26.19
1941 33.19
1942 33.44
1943 43.05
1944 34.02
1945 20.95
1946 37.52
1947 59.51
1948 89.17
1949 67.55
1950 62.85
1951 88.87
1952 91.32
1953 78.59
1954 81.31
1955 95.14
1956 103.3
1957 120
1958 118.7
1959 131.7
1960 141.4
1961 151.1
1962 162.6
1963 173.7
1964 189.6
1965 197.7
1966 177.7
1967 191.1
1968 203.1
1969 214.3
1970 257.5
1971 235.9
1972 228.1
1973 236.6
1974 267.4
1975 267.5
1976 245.6
1977 288.6
1978 260.6
1979 285.1
1980 292
1981 267
1982 242
1983 186
1984 184
1985 191
1986 165.5
1987 164
1988 151
1989 122
1990 118.5
1991 97
1992 70.5
1993 61
1994 57.5
1995 48.5
1996 52.5
1997 49.5
1998 44.5
1999 42.5
2000 38