Year Kilotonnes
1850 0.00159
1851 0.00159
1852 0.00319
1853 0.00479
1854 0.00638
1855 0.00798
1856 0.00958
1857 0.01118
1858 0.01278
1859 0.01439
1860 0.01599
1861 0.03179
1862 0.04759
1863 0.06339
1864 0.07919
1865 0.09499
1866 0.1108
1867 0.1266
1868 0.1424
1869 0.1582
1870 0.174
1871 0.1898
1872 0.2063
1873 0.2227
1874 0.2392
1875 0.2557
1876 0.2721
1877 0.2886
1878 0.3051
1879 0.3215
1880 0.338
1881 0.3828
1882 0.3568
1883 0.3591
1884 0.3615
1885 0.3978
1886 0.434
1887 0.4703
1888 0.5082
1889 0.5649
1890 0.5972
1891 0.5031
1892 0.6491
1893 0.567
1894 0.7048
1895 0.6223
1896 0.6998
1897 0.7886
1898 0.8154
1899 0.8225
1900 0.9828
1901 1.07
1902 0.5642
1903 0.6178
1904 0.7337
1905 0.7969
1906 0.779
1907 0.8437
1908 1.106
1909 1.014
1910 1.21
1911 1.051
1912 1.205
1913 1.377
1914 1.488
1915 1.701
1916 1.871
1917 1.607
1918 1.725
1919 1.887
1920 1.981
1921 2.717
1922 2.801
1923 3.431
1924 3.621
1925 3.588
1926 3.523
1927 3.853
1928 3.997
1929 4.497
1930 4.895
1931 4.035
1932 3.364
1933 4.06
1934 4.9
1935 5.251
1936 5.446
1937 6.939
1938 6.669
1939 7.103
1940 6.604
1941 6.81
1942 6.942
1943 6.964
1944 6.765
1945 6.708
1946 6.499
1947 6.868
1948 7.991
1949 8.273
1950 8.646
1951 8.613
1952 9.483
1953 9.921
1954 10.19
1955 10.76
1956 11.87
1957 12.14
1958 12.41
1959 12.93
1960 11.99
1961 12.58
1962 13.08
1963 12.66
1964 14.42
1965 15.72
1966 15.65
1967 15.21
1968 16.39
1969 15.97
1970 16.81
1971 17.42
1972 17.72
1973 19.21
1974 20.45
1975 18.5
1976 18.14
1977 19.51
1978 19.41
1979 20.23
1980 21.08
1981 21.53
1982 21.01
1983 20.71
1984 20.89
1985 20.97
1986 20.97
1987 21.46
1988 21.36
1989 21.46
1990 20.84
1991 20.92
1992 20.99
1993 21.07
1994 21.15
1995 21.23
1996 21.3
1997 21.38
1998 21.46
1999 21.54
2000 21.62