Year Kilotonnes
1850 0.0666
1851 0.07223
1852 0.1443
1853 0.2153
1854 0.2853
1855 0.3569
1856 0.4353
1857 0.5128
1858 0.5798
1859 0.654
1860 0.7226
1861 0.7982
1862 0.8748
1863 0.9452
1864 1.014
1865 1.084
1866 1.155
1867 1.235
1868 1.306
1869 1.372
1870 1.462
1871 1.538
1872 1.593
1873 2.107
1874 1.669
1875 3.231
1876 3.226
1877 2.083
1878 2.011
1879 2.19
1880 2.617
1881 2.707
1882 3.203
1883 3.412
1884 3.659
1885 3.489
1886 3.795
1887 3.944
1888 4.258
1889 4.881
1890 5.233
1891 5.388
1892 5.275
1893 4.698
1894 5.502
1895 5.233
1896 5.333
1897 5.615
1898 6.242
1899 6.5
1900 7.414
1901 7.319
1902 7.909
1903 7.795
1904 8.005
1905 7.85
1906 8.985
1907 9.849
1908 9.809
1909 9.906
1910 10.03
1911 9.64
1912 10.88
1913 11.36
1914 9.955
1915 9.158
1916 9.054
1917 5.603
1918 4.063
1919 7.328
1920 7.414
1921 7.118
1922 9.54
1923 9.002
1924 9.953
1925 10.03
1926 9.563
1927 11.71
1928 11.91
1929 13.26
1930 14.39
1931 12.64
1932 9.849
1933 11.84
1934 12.34
1935 13.52
1936 12.87
1937 15.56
1938 12.95
1939 16.53
1940 13.52
1941 13.47
1942 11.96
1943 12.45
1944 13.7
1945 14.39
1946 17.29
1947 26.45
1948 24.11
1949 25.42
1950 20.06
1951 20.51
1952 20.34
1953 16.64
1954 23.46
1955 27.04
1956 29.21
1957 33.89
1958 32.74
1959 32.79
1960 33.14
1961 34.66
1962 34.8
1963 39.94
1964 40.94
1965 43.17
1966 42.94
1967 43.27
1968 44.35
1969 47.07
1970 58
1971 53.45
1972 62.93
1973 66.28
1974 88.3
1975 89
1976 86.66
1977 96.32
1978 93.09
1979 122.9
1980 133
1981 135.8
1982 144.5
1983 153
1984 114.3
1985 99
1986 117
1987 109
1988 102
1989 146.4
1990 161
1991 153.5
1992 186.5
1993 160
1994 149
1995 166.5
1996 136
1997 146.5
1998 171
1999 171.5
2000 156