Year Kilotonnes
1850 0
1851 0.00922
1852 0.01843
1853 0.02765
1854 0.03686
1855 0.04608
1856 0.0553
1857 0.06451
1858 0.07373
1859 0.08294
1860 0.09216
1861 0.1009
1862 0.1096
1863 0.1183
1864 0.1268
1865 0.1353
1866 0.1437
1867 0.152
1868 0.1602
1869 0.1684
1870 0.1764
1871 0.2006
1872 0.2249
1873 0.2491
1874 0.2732
1875 0.3303
1876 0.3606
1877 0.3867
1878 0.4287
1879 0.4685
1880 0.4911
1881 0.5104
1882 0.5386
1883 0.5808
1884 0.6455
1885 0.7114
1886 0.7121
1887 0.7775
1888 0.8524
1889 0.9567
1890 1.026
1891 1.122
1892 1.191
1893 1.16
1894 1.324
1895 1.44
1896 1.523
1897 1.571
1898 1.804
1899 2.441
1900 1.779
1901 2.328
1902 2.94
1903 2.684
1904 2.366
1905 2.651
1906 2.802
1907 2.839
1908 3.079
1909 3.409
1910 4.432
1911 3.865
1912 3.83
1913 4.472
1914 5.514
1915 5.73
1916 6.097
1917 5.823
1918 5.665
1919 5.925
1920 6.239
1921 8.212
1922 8.821
1923 9.431
1924 11.03
1925 12.17
1926 11.52
1927 13.28
1928 17.45
1929 17.37
1930 17.23
1931 15.25
1932 15.14
1933 14.04
1934 14.26
1935 15.91
1936 19.6
1937 20.7
1938 20.95
1939 23.47
1940 22.44
1941 20.92
1942 11.17
1943 9.167
1944 4.828
1945 2.078
1946 2.357
1947 2.232
1948 3.196
1949 3.413
1950 12.02
1951 20.63
1952 29.23
1953 37.84
1954 46.45
1955 55.05
1956 44.39
1957 38.56
1958 78.54
1959 114.5
1960 136
1961 143.2
1962 177.9
1963 168.2
1964 180.3
1965 190
1966 197.3
1967 165.4
1968 175.5
1969 175.6
1970 24.98
1971 23.66
1972 18.12
1973 25.16
1974 30.08
1975 41.72
1976 43.87
1977 47.92
1978 46.41
1979 48.11
1980 48.54
1981 48.44
1982 49.37
1983 51.1
1984 43.5
1985 46.2
1986 52
1987 56.65
1988 57.95
1989 54.1
1990 56.5
1991 57
1992 67.45
1993 67.1
1994 68.2
1995 66.5
1996 111.1
1997 136.5
1998 110.8
1999 96
2000 88.83