Year Kilotonnes
1850 0.1035
1851 0.1312
1852 0.1457
1853 0.1674
1854 0.1984
1855 0.2163
1856 0.2304
1857 0.2401
1858 0.2525
1859 0.2758
1860 0.2911
1861 0.2837
1862 0.298
1863 0.3396
1864 0.3615
1865 0.3741
1866 0.4291
1867 0.4442
1868 0.4978
1869 0.5536
1870 0.5893
1871 0.6165
1872 0.7405
1873 0.8092
1874 0.7865
1875 0.8027
1876 0.7915
1877 0.8661
1878 0.8485
1879 1.011
1880 1.137
1881 1.205
1882 1.35
1883 1.477
1884 1.569
1885 1.591
1886 1.644
1887 1.873
1888 2.147
1889 2.041
1890 2.275
1891 2.442
1892 2.594
1893 2.628
1894 2.484
1895 2.772
1896 2.81
1897 2.934
1898 3.199
1899 3.653
1900 3.875
1901 4.218
1902 4.391
1903 5.147
1904 5.151
1905 5.744
1906 6.041
1907 6.855
1908 6.176
1909 6.806
1910 7.364
1911 7.379
1912 7.98
1913 8.563
1914 7.731
1915 8.107
1916 9.261
1917 10.08
1918 10.55
1919 8.548
1920 9.875
1921 7.762
1922 7.723
1923 10.38
1924 9.24
1925 9.39
1926 10.09
1927 10.04
1928 9.7
1929 10.38
1930 9.205
1931 7.593
1932 6.211
1933 6.625
1934 7.297
1935 7.545
1936 8.746
1937 9.244
1938 7.657
1939 8.63
1940 9.719
1941 11.05
1942 11.78
1943 12.73
1944 12.8
1945 12.17
1946 11.05
1947 12.44
1948 11.76
1949 10.19
1950 10.88
1951 10.71
1952 10.37
1953 10.33
1954 10.08
1955 10.46
1956 10.76
1957 10.72
1958 10.93
1959 11.07
1960 10.98
1961 10.9
1962 11.21
1963 11.7
1964 12.27
1965 12.97
1966 13.73
1967 13.88
1968 14.64
1969 14.74
1970 15.1
1971 64.95
1972 59.23
1973 79.75
1974 68.68
1975 48.73
1976 50.29
1977 86.13
1978 53.08
1979 50.7
1980 68.55
1981 50.78
1982 48.65
1983 34
1984 26.15
1985 4.475
1986 3.533
1987 2.795
1988 2.248
1989 1.784
1990 1.404
1991 1.366
1992 1.311
1993 1.298
1994 1.258
1995 1.237
1996 1.253
1997 1.249
1998 1.252
1999 1.252
2000 1.262