Year Kilotonnes
1850 0.0005
1851 0.0005
1852 0.00101
1853 0.00151
1854 0.00201
1855 0.00252
1856 0.00302
1857 0.00353
1858 0.00404
1859 0.00454
1860 0.00505
1861 0.01003
1862 0.01502
1863 0.02001
1864 0.02499
1865 0.02998
1866 0.03497
1867 0.03996
1868 0.04495
1869 0.04994
1870 0.05493
1871 0.05992
1872 0.1199
1873 0.1799
1874 0.2399
1875 0.3
1876 0.3602
1877 0.4203
1878 0.4806
1879 0.5408
1880 0.6011
1881 0.6615
1882 0.7219
1883 0.7823
1884 0.8428
1885 0.9034
1886 0.9639
1887 1.025
1888 1.085
1889 1.146
1890 1.207
1891 1.267
1892 1.328
1893 1.389
1894 1.45
1895 1.511
1896 1.572
1897 1.633
1898 1.694
1899 1.755
1900 1.817
1901 1.878
1902 1.939
1903 2
1904 2.062
1905 2.123
1906 2.185
1907 2.246
1908 2.308
1909 2.369
1910 2.431
1911 8.685
1912 28.15
1913 49.02
1914 51.82
1915 64.02
1916 75.18
1917 40.04
1918 62
1919 78.05
1920 84.7
1921 115.1
1922 127
1923 127.4
1924 122.2
1925 123.3
1926 117.1
1927 126.2
1928 84.31
1929 92.69
1930 93.16
1931 108.5
1932 125.2
1933 136.4
1934 123
1935 132.3
1936 156.3
1937 182.7
1938 204
1939 252.7
1940 195.7
1941 228
1942 217.4
1943 224.4
1944 203.6
1945 213.5
1946 200.9
1947 210.1
1948 258
1949 228.8
1950 229.4
1951 171.6
1952 218.1
1953 259
1954 220.8
1955 238.7
1956 253.3
1957 262.5
1958 303.3
1959 244.8
1960 195.2
1961 200.8
1962 216
1963 193.8
1964 236.5
1965 260.4
1966 267.6
1967 141.1
1968 4.935
1969 8.944
1970 88.69
1971 153.3
1972 160.9
1973 176.8
1974 187.3
1975 187.3
1976 186.6
1977 193.8
1978 210.5
1979 275.1
1980 330.6
1981 344.8
1982 334.7
1983 306.6
1984 298.7
1985 302.3
1986 281.2
1987 308.8
1988 333.7
1989 335.5
1990 340.9
1991 375
1992 386.1
1993 294.2
1994 332.6
1995 382.2
1996 407.3
1997 414.1
1998 333.2
1999 348.7
2000 292.6