Year Kilotonnes
1850 0.01061
1851 0.01191
1852 0.02379
1853 0.03554
1854 0.04715
1855 0.05899
1856 0.0717
1857 0.0843
1858 0.09553
1859 0.1077
1860 0.1195
1861 0.141
1862 0.1425
1863 0.1508
1864 0.1643
1865 0.1668
1866 0.1862
1867 0.2116
1868 0.175
1869 0.2412
1870 0.2657
1871 0.3588
1872 0.3726
1873 0.3509
1874 0.4136
1875 0.4923
1876 0.601
1877 0.5996
1878 0.7965
1879 0.8188
1880 0.9552
1881 1.003
1882 1.065
1883 1.206
1884 1.182
1885 1.266
1886 1.319
1887 1.3
1888 1.492
1889 1.753
1890 1.703
1891 1.809
1892 1.941
1893 2.201
1894 2.418
1895 2.649
1896 2.736
1897 3.151
1898 3.537
1899 4.161
1900 4.722
1901 4.776
1902 4.672
1903 4.904
1904 5.365
1905 4.903
1906 5.585
1907 6.425
1908 6.535
1909 6.781
1910 6.593
1911 7.197
1912 7.842
1913 9.081
1914 7.575
1915 6.777
1916 7.449
1917 6.714
1918 2.729
1919 2.089
1920 1.905
1921 2.088
1922 2.586
1923 2.882
1924 3.611
1925 3.694
1926 5.572
1927 7.051
1928 7.847
1929 8.979
1930 10.95
1931 13.02
1932 14.33
1933 16.54
1934 20.24
1935 23.45
1936 27.31
1937 28.08
1938 29.81
1939 32.64
1940 36.73
1941 36.2
1942 35.69
1943 35.18
1944 34.64
1945 34.12
1946 37.44
1947 41.57
1948 46.81
1949 52.07
1950 57.28
1951 61.67
1952 65.69
1953 69.28
1954 75.27
1955 84.27
1956 91.75
1957 97.68
1958 101.7
1959 103.5
1960 105
1961 104.1
1962 106.7
1963 108.5
1964 112.3
1965 117.5
1966 119.9
1967 122.8
1968 123.5
1969 126.1
1970 130
1971 132.9
1972 136.4
1973 140.1
1974 145.1
1975 149.5
1976 150.1
1977 153.8
1978 155.3
1979 154.4
1980 155.5
1981 156
1982 152
1983 155
1984 151.5
1985 152
1986 158
1987 158
1988 150
1989 149
1990 111
1991 117
1992 69.5
1993 62.5
1994 58.5
1995 47
1996 46.5
1997 38.5
1998 47
1999 35
2000 21.55