Year Kilotonnes
1850 1.048
1851 0.9745
1852 1.053
1853 1.141
1854 1.442
1855 1.443
1856 2.094
1857 2.176
1858 1.631
1859 2.069
1860 1.818
1861 2.579
1862 2.288
1863 2.533
1864 2.209
1865 3.351
1866 3.117
1867 3.1
1868 3.638
1869 3.204
1870 3.886
1871 4.051
1872 3.858
1873 3.896
1874 4.263
1875 4.911
1876 5.237
1877 5.235
1878 4.932
1879 5.565
1880 6.218
1881 6.641
1882 7.164
1883 8.175
1884 8.218
1885 8.61
1886 8.321
1887 8.585
1888 9.667
1889 10.4
1890 10.04
1891 10.74
1892 10.65
1893 10.32
1894 11.66
1895 11.96
1896 15.43
1897 15.46
1898 15.98
1899 17.81
1900 17.7
1901 18.44
1902 18.74
1903 19.53
1904 21.13
1905 20.57
1906 22.48
1907 20.5
1908 25.06
1909 27.49
1910 25.35
1911 26.97
1912 31.74
1913 33.02
1914 33.19
1915 35.88
1916 33.7
1917 19.58
1918 19.17
1919 20.63
1920 24.39
1921 21.73
1922 31.43
1923 36.08
1924 42.56
1925 37.31
1926 35.12
1927 44.64
1928 41.61
1929 50.61
1930 48.31
1931 49.22
1932 47.81
1933 47.88
1934 50.45
1935 52.14
1936 55.32
1937 56.35
1938 51.71
1939 62.33
1940 39.7
1941 36.82
1942 33.41
1943 38.84
1944 35.2
1945 20.09
1946 48.5
1947 78.55
1948 82.24
1949 114.1
1950 86.58
1951 125.7
1952 118.7
1953 102.1
1954 106.5
1955 132.5
1956 112.1
1957 132.9
1958 118.8
1959 121.1
1960 154.5
1961 164.4
1962 191.8
1963 218.7
1964 227.6
1965 226.7
1966 252.3
1967 266.2
1968 276.3
1969 277.9
1970 287
1971 228.1
1972 202.9
1973 212
1974 224.7
1975 209
1976 181.4
1977 198.2
1978 184.7
1979 206.5
1980 226.1
1981 185.2
1982 189.4
1983 161.4
1984 152.7
1985 169.7
1986 143.9
1987 127.5
1988 125.1
1989 98.39
1990 88
1991 117.5
1992 90
1993 72.5
1994 72.5
1995 68
1996 86
1997 49
1998 36
1999 26.5
2000 13.5