Year Kilotonnes
1850 0.00201
1851 0.00225
1852 0.00288
1853 0.00577
1854 0.00865
1855 0.01155
1856 0.01444
1857 0.01734
1858 0.02025
1859 0.02315
1860 0.02607
1861 0.02898
1862 0.0319
1863 0.03482
1864 0.03775
1865 0.04068
1866 0.04361
1867 0.04655
1868 0.04949
1869 0.05244
1870 0.05539
1871 0.05834
1872 0.0613
1873 0.06426
1874 0.06722
1875 0.07019
1876 0.07316
1877 0.07614
1878 0.07912
1879 0.0821
1880 0.08509
1881 0.08808
1882 0.09107
1883 0.09407
1884 0.09707
1885 0.1001
1886 0.1031
1887 0.1061
1888 0.1091
1889 0.1121
1890 0.1152
1891 0.1182
1892 0.1212
1893 0.1243
1894 0.1273
1895 0.1204
1896 0.08923
1897 0.1203
1898 0.1253
1899 0.1303
1900 0.161
1901 0.2001
1902 0.2265
1903 0.2073
1904 0.2139
1905 0.2477
1906 0.2475
1907 0.369
1908 0.3675
1909 0.4007
1910 0.4046
1911 0.3885
1912 0.4342
1913 0.4626
1914 0.746
1915 1.029
1916 1.313
1917 1.596
1918 1.88
1919 2.163
1920 2.447
1921 2.73
1922 3.679
1923 2.211
1924 2.667
1925 2.985
1926 3.299
1927 3.572
1928 4.348
1929 5.055
1930 5.961
1931 6.446
1932 6.207
1933 5.792
1934 6.502
1935 7.263
1936 7.659
1937 7.392
1938 8.592
1939 9.331
1940 9.673
1941 10.31
1942 7.929
1943 6.855
1944 5.859
1945 4.93
1946 3.602
1947 7.448
1948 10.72
1949 13.05
1950 15.38
1951 17.06
1952 15.14
1953 14.75
1954 13.66
1955 15.32
1956 16.34
1957 18.49
1958 19.55
1959 20.09
1960 22.06
1961 23.51
1962 24.99
1963 26.13
1964 29.32
1965 31.93
1966 31.47
1967 32.46
1968 30.45
1969 32
1970 33.07
1971 36.67
1972 39.52
1973 38.92
1974 41.96
1975 43.07
1976 45.54
1977 46.01
1978 45.47
1979 46.7
1980 48.79
1981 50.19
1982 50.4
1983 54.13
1984 54
1985 55.31
1986 55
1987 54.64
1988 55.42
1989 55.82
1990 54.59
1991 54.59
1992 52.57
1993 48.75
1994 47.52
1995 46.95
1996 52.5
1997 8.5
1998 52.5
1999 52.5
2000 52.6