Year Kilotonnes
1850 0.01909
1851 0.02071
1852 0.04139
1853 0.06192
1854 0.08232
1855 0.1029
1856 0.1245
1857 0.1459
1858 0.1659
1859 0.1869
1860 0.2071
1861 0.2278
1862 0.2485
1863 0.2683
1864 0.2878
1865 0.3074
1866 0.327
1867 0.3478
1868 0.2975
1869 0.3888
1870 0.4092
1871 0.4927
1872 0.4119
1873 0.4367
1874 0.4172
1875 0.4359
1876 0.4579
1877 0.4793
1878 0.4981
1879 0.5183
1880 0.5395
1881 0.5564
1882 0.5742
1883 0.5898
1884 0.6061
1885 0.6216
1886 0.6352
1887 0.6503
1888 0.6648
1889 0.6794
1890 0.6925
1891 0.706
1892 0.72
1893 0.6828
1894 0.6938
1895 0.6849
1896 0.7771
1897 0.8062
1898 0.9407
1899 0.7956
1900 1.027
1901 0.9753
1902 0.8484
1903 0.8602
1904 0.7801
1905 0.6849
1906 0.7569
1907 0.9984
1908 1.397
1909 1.381
1910 1.712
1911 1.883
1912 2.088
1913 2.297
1914 2.174
1915 2.071
1916 2.054
1917 2.012
1918 1.942
1919 1.782
1920 1.712
1921 1.935
1922 2.095
1923 2.638
1924 3.45
1925 4.452
1926 4.435
1927 5.603
1928 5.867
1929 6.879
1930 7.877
1931 7.305
1932 7.452
1933 7.247
1934 7.466
1935 6.849
1936 4.925
1937 3.335
1938 1.765
1939 1.106
1940 0.6849
1941 0.5876
1942 0.5656
1943 0.5008
1944 0.4096
1945 0.3425
1946 0.7969
1947 1.852
1948 4.12
1949 10.58
1950 16.44
1951 18.56
1952 16.81
1953 17.72
1954 19.32
1955 20.89
1956 18.87
1957 20.04
1958 20.47
1959 32.79
1960 37.33
1961 37.6
1962 40.58
1963 48.29
1964 51.3
1965 67.47
1966 67.74
1967 74.96
1968 76.67
1969 85.09
1970 96.58
1971 121
1972 128.8
1973 173.3
1974 157.9
1975 179.5
1976 204.4
1977 197.9
1978 191.9
1979 216.2
1980 200
1981 230.7
1982 218.1
1983 234.8
1984 241.1
1985 250
1986 251.4
1987 269.4
1988 267.6
1989 266.4
1990 245.5
1991 266.5
1992 272
1993 271.5
1994 256
1995 267.5
1996 261
1997 257.5
1998 262
1999 268.5
2000 245