Year Kilotonnes
1850 0.00144
1851 0.00162
1852 0.00323
1853 0.00482
1854 0.0064
1855 0.008
1856 0.00973
1857 0.01144
1858 0.01296
1859 0.01461
1860 0.01622
1861 0.01913
1862 0.01934
1863 0.02046
1864 0.02229
1865 0.02263
1866 0.02527
1867 0.02871
1868 0.02375
1869 0.03274
1870 0.03606
1871 0.04869
1872 0.05056
1873 0.04762
1874 0.05613
1875 0.0668
1876 0.08155
1877 0.08137
1878 0.1081
1879 0.1111
1880 0.1296
1881 0.1361
1882 0.1446
1883 0.1637
1884 0.1603
1885 0.1718
1886 0.179
1887 0.1764
1888 0.2025
1889 0.2378
1890 0.2311
1891 0.2455
1892 0.2634
1893 0.2986
1894 0.3281
1895 0.3595
1896 0.3712
1897 0.4276
1898 0.4799
1899 0.5646
1900 0.6408
1901 0.648
1902 0.6339
1903 0.6655
1904 0.7281
1905 0.6653
1906 0.7579
1907 0.8719
1908 0.8868
1909 0.9201
1910 0.8947
1911 0.9766
1912 1.064
1913 1.232
1914 1.028
1915 0.9197
1916 1.011
1917 0.9111
1918 0.3704
1919 0.2835
1920 0.2585
1921 0.2833
1922 0.351
1923 0.391
1924 0.49
1925 0.5012
1926 0.7561
1927 0.9567
1928 1.065
1929 1.218
1930 1.486
1931 1.767
1932 1.944
1933 2.245
1934 2.747
1935 3.183
1936 3.706
1937 3.81
1938 4.045
1939 4.43
1940 4.984
1941 4.912
1942 4.843
1943 4.773
1944 4.701
1945 4.629
1946 5.081
1947 5.64
1948 6.352
1949 7.066
1950 7.773
1951 8.368
1952 8.915
1953 9.401
1954 10.21
1955 11.44
1956 12.45
1957 13.26
1958 13.8
1959 14.05
1960 14.24
1961 14.13
1962 14.48
1963 14.73
1964 15.24
1965 15.95
1966 16.26
1967 16.67
1968 16.76
1969 17.12
1970 17.64
1971 18.04
1972 18.51
1973 19.01
1974 19.69
1975 20.29
1976 20.37
1977 20.87
1978 21.08
1979 20.95
1980 21.1
1981 19.68
1982 20.19
1983 19.51
1984 20.04
1985 24.68
1986 26.64
1987 27.45
1988 28.62
1989 28.03
1990 25.01
1991 26.05
1992 20.4
1993 15.8
1994 10.5
1995 7.85
1996 7
1997 4.95
1998 5.4
1999 4.36
2000 4.855