Year Kilotonnes
1850 0.00835
1851 0.00937
1852 0.01199
1853 0.02399
1854 0.03601
1855 0.04805
1856 0.0601
1857 0.07217
1858 0.08425
1859 0.09635
1860 0.1085
1861 0.1206
1862 0.1327
1863 0.1449
1864 0.1571
1865 0.1693
1866 0.1815
1867 0.1937
1868 0.2059
1869 0.2182
1870 0.2305
1871 0.2428
1872 0.2551
1873 0.2674
1874 0.2797
1875 0.2921
1876 0.3044
1877 0.3168
1878 0.3292
1879 0.3416
1880 0.3541
1881 0.3665
1882 0.379
1883 0.3914
1884 0.4039
1885 0.4164
1886 0.429
1887 0.4415
1888 0.454
1889 0.4666
1890 0.4792
1891 0.4918
1892 0.5044
1893 0.5171
1894 0.5297
1895 0.5011
1896 0.3713
1897 0.5006
1898 0.5213
1899 0.5421
1900 0.6699
1901 0.8326
1902 0.9426
1903 0.8626
1904 0.8899
1905 1.031
1906 1.03
1907 1.535
1908 1.529
1909 1.667
1910 1.684
1911 1.616
1912 1.807
1913 1.925
1914 3.104
1915 4.283
1916 5.463
1917 6.642
1918 7.821
1919 9.001
1920 10.18
1921 11.36
1922 15.31
1923 9.199
1924 11.1
1925 12.42
1926 13.73
1927 14.86
1928 18.09
1929 21.03
1930 24.8
1931 26.82
1932 25.83
1933 24.1
1934 27.05
1935 30.22
1936 31.87
1937 30.76
1938 35.75
1939 38.83
1940 40.25
1941 42.91
1942 32.99
1943 28.52
1944 24.38
1945 20.51
1946 14.99
1947 30.99
1948 44.59
1949 54.31
1950 63.99
1951 71
1952 62.98
1953 61.38
1954 56.83
1955 63.74
1956 68
1957 76.93
1958 81.33
1959 83.59
1960 91.77
1961 97.82
1962 104
1963 108.7
1964 122
1965 132.9
1966 131
1967 135.1
1968 126.7
1969 133.1
1970 137.6
1971 152.6
1972 164.4
1973 162
1974 174.6
1975 179.2
1976 189.5
1977 191.4
1978 189.2
1979 194.3
1980 203
1981 204
1982 204.5
1983 220
1984 228
1985 239
1986 235
1987 242
1988 251
1989 253
1990 254
1991 223
1992 174
1993 200.5
1994 212
1995 231
1996 217
1997 261
1998 260.5
1999 68.27
2000 68.27