Year Kilotonnes
1850 0
1851 0.00003
1852 0.00006
1853 0.00009
1854 0.00012
1855 0.00015
1856 0.00018
1857 0.00021
1858 0.00024
1859 0.00027
1860 0.0003
1861 0.00033
1862 0.00036
1863 0.00039
1864 0.00041
1865 0.00044
1866 0.00047
1867 0.0005
1868 0.00052
1869 0.00055
1870 0.00057
1871 0.00065
1872 0.00073
1873 0.00081
1874 0.00089
1875 0.00108
1876 0.00118
1877 0.00126
1878 0.0014
1879 0.00153
1880 0.0016
1881 0.00166
1882 0.00176
1883 0.00189
1884 0.0021
1885 0.00232
1886 0.00232
1887 0.00253
1888 0.00278
1889 0.00312
1890 0.00334
1891 0.00366
1892 0.00388
1893 0.00378
1894 0.00431
1895 0.00469
1896 0.00496
1897 0.00512
1898 0.00588
1899 0.00626
1900 0.00692
1901 0.00778
1902 0.00847
1903 0.00891
1904 0.01784
1905 0.02676
1906 0.0357
1907 0.04464
1908 0.1116
1909 0.335
1910 0.324
1911 0.2235
1912 0.03354
1913 0.04026
1914 0.04699
1915 0.05372
1916 0.06046
1917 0.0672
1918 0.1793
1919 0.3699
1920 0.6615
1921 0.4487
1922 0.4713
1923 0.4827
1924 0.539
1925 0.5504
1926 0.3259
1927 0.2585
1928 0.3149
1929 0.1912
1930 0.2363
1931 0.2139
1932 0.2027
1933 0.1802
1934 0.2592
1935 0.2706
1936 0.3383
1937 2.303
1938 4.458
1939 8.471
1940 9.589
1941 10.45
1942 9.187
1943 7.952
1944 6.741
1945 5.554
1946 4.39
1947 3.585
1948 2.808
1949 7.663
1950 10.69
1951 13.09
1952 12.72
1953 13.2
1954 16.35
1955 24.93
1956 33.14
1957 44.07
1958 50.83
1959 52.79
1960 49.18
1961 61.17
1962 67.46
1963 77.35
1964 76.24
1965 76.55
1966 85.59
1967 101.7
1968 125.8
1969 136.5
1970 160.3
1971 181.8
1972 189.7
1973 192.7
1974 194
1975 200.6
1976 207.5
1977 245.5
1978 232
1979 251.4
1980 266.5
1981 244.5
1982 225
1983 212.5
1984 188.3
1985 196.9
1986 197.6
1987 189
1988 205.1
1989 207.9
1990 205.9
1991 209.1
1992 214.7
1993 231.2
1994 231.7
1995 237.8
1996 303.4
1997 330.1
1998 290.3
1999 317
2000 350.2