Year Kilotonnes
1850 0.5591
1851 0.6064
1852 0.6659
1853 0.7052
1854 0.76
1855 0.7846
1856 0.8195
1857 0.8052
1858 0.8181
1859 0.8868
1860 0.9825
1861 1.035
1862 1.048
1863 1.093
1864 1.173
1865 1.241
1866 1.286
1867 1.342
1868 1.365
1869 1.44
1870 1.448
1871 1.508
1872 1.664
1873 1.754
1874 1.699
1875 1.783
1876 1.822
1877 1.86
1878 1.875
1879 1.92
1880 2.125
1881 2.248
1882 2.338
1883 2.455
1884 2.41
1885 2.432
1886 2.369
1887 2.495
1888 2.589
1889 2.735
1890 2.867
1891 2.938
1892 2.889
1893 2.776
1894 3
1895 3.071
1896 3.243
1897 3.336
1898 3.382
1899 3.606
1900 3.755
1901 3.74
1902 3.782
1903 3.901
1904 3.991
1905 4.068
1906 4.322
1907 4.552
1908 4.566
1909 4.629
1910 4.804
1911 4.883
1912 5.068
1913 5.244
1914 4.749
1915 4.839
1916 5.247
1917 5.098
1918 4.794
1919 4.259
1920 4.435
1921 3.982
1922 4.331
1923 4.307
1924 12.85
1925 17.03
1926 12.7
1927 16.84
1928 20.92
1929 24.96
1930 20.68
1931 16.45
1932 12.26
1933 16.25
1934 16.16
1935 48.18
1936 67.84
1937 111
1938 145.8
1939 121.4
1940 35.04
1941 0.3853
1942 0.3813
1943 0.3774
1944 0.3734
1945 3.694
1946 29.23
1947 43.37
1948 57.19
1949 70.69
1950 56.01
1951 62.24
1952 68.46
1953 74.35
1954 90.15
1955 79.15
1956 117.4
1957 128.7
1958 104.9
1959 113
1960 111.5
1961 88.59
1962 75.32
1963 77.24
1964 49.79
1965 60.62
1966 71.16
1967 42.04
1968 60.73
1969 51.65
1970 45.5
1971 42.15
1972 54.06
1973 49.2
1974 41.46
1975 32.51
1976 27.16
1977 25.4
1978 20.46
1979 14.29
1980 14
1981 14
1982 16.5
1983 15
1984 16.5
1985 17.5
1986 19
1987 19.5
1988 21
1989 21
1990 23
1991 16.5
1992 19.5
1993 21.5
1994 21
1995 20.5
1996 22.5
1997 23.5
1998 24.5
1999 25
2000 24.57