Year Kilotonnes
1850 0.00007
1851 0.00007
1852 0.00014
1853 0.00021
1854 0.00029
1855 0.00036
1856 0.00043
1857 0.0005
1858 0.00057
1859 0.00065
1860 0.00072
1861 0.00143
1862 0.00214
1863 0.00285
1864 0.00356
1865 0.00427
1866 0.00498
1867 0.00569
1868 0.0064
1869 0.00711
1870 0.00782
1871 0.00853
1872 0.00927
1873 0.01001
1874 0.01074
1875 0.01148
1876 0.01222
1877 0.01296
1878 0.0137
1879 0.01444
1880 0.01518
1881 0.01719
1882 0.01603
1883 0.01613
1884 0.01624
1885 0.01787
1886 0.0195
1887 0.02113
1888 0.02283
1889 0.02538
1890 0.02683
1891 0.0226
1892 0.02916
1893 0.02547
1894 0.03166
1895 0.02795
1896 0.03144
1897 0.03542
1898 0.03663
1899 0.03695
1900 0.04414
1901 0.04808
1902 0.02534
1903 0.02775
1904 0.03296
1905 0.06593
1906 0.09894
1907 0.132
1908 1.538
1909 1.57
1910 1.603
1911 1.635
1912 1.668
1913 3.07
1914 4.47
1915 7.238
1916 7.267
1917 5.93
1918 4.595
1919 4.626
1920 4.657
1921 4.668
1922 4.679
1923 4.689
1924 5.868
1925 3.882
1926 2.754
1927 6.526
1928 11.08
1929 11.61
1930 13.94
1931 13.8
1932 90.98
1933 138.1
1934 180.4
1935 187.7
1936 185.6
1937 264.7
1938 268.5
1939 265.8
1940 327.2
1941 282.1
1942 301.8
1943 303.3
1944 264.3
1945 230.2
1946 215.2
1947 226.7
1948 247.5
1949 295.8
1950 310.5
1951 342.6
1952 341.7
1953 391.6
1954 419.6
1955 374.7
1956 415.8
1957 443.1
1958 401.5
1959 537.3
1960 562.2
1961 553.8
1962 534.1
1963 550.8
1964 598.8
1965 653.1
1966 574
1967 608.9
1968 732.1
1969 735.3
1970 724.8
1971 670.3
1972 741.2
1973 801.6
1974 887.4
1975 742.1
1976 744.5
1977 768.9
1978 744.6
1979 676
1980 758.6
1981 708.2
1982 680
1983 661.3
1984 580.2
1985 543.9
1986 529.2
1987 536.2
1988 502.2
1989 542.3
1990 505.3
1991 497.4
1992 568.7
1993 559.3
1994 390.8
1995 382.9
1996 415
1997 450
1998 479.2
1999 458.7
2000 431.2