Year Kilotonnes
1850 0.00481
1851 0.0054
1852 0.00691
1853 0.01383
1854 0.02076
1855 0.02769
1856 0.03464
1857 0.04159
1858 0.04856
1859 0.05553
1860 0.06251
1861 0.0695
1862 0.0765
1863 0.08351
1864 0.09053
1865 0.09756
1866 0.1046
1867 0.1116
1868 0.1187
1869 0.1258
1870 0.1328
1871 0.1399
1872 0.147
1873 0.1541
1874 0.1612
1875 0.1683
1876 0.1755
1877 0.1826
1878 0.1897
1879 0.1969
1880 0.2041
1881 0.2112
1882 0.2184
1883 0.2256
1884 0.2328
1885 0.24
1886 0.2472
1887 0.2545
1888 0.2617
1889 0.2689
1890 0.2762
1891 0.2835
1892 0.2907
1893 0.298
1894 0.3053
1895 0.2888
1896 0.214
1897 0.2885
1898 0.3005
1899 0.3124
1900 0.3861
1901 0.4799
1902 0.5432
1903 0.4971
1904 0.5129
1905 0.5941
1906 0.5936
1907 0.885
1908 0.8813
1909 0.961
1910 0.9704
1911 0.9316
1912 1.041
1913 1.109
1914 1.789
1915 2.469
1916 3.149
1917 3.828
1918 4.508
1919 5.188
1920 5.867
1921 6.547
1922 8.822
1923 5.302
1924 6.396
1925 7.159
1926 7.911
1927 8.566
1928 10.43
1929 12.12
1930 14.3
1931 15.46
1932 14.89
1933 13.89
1934 15.59
1935 17.42
1936 18.37
1937 17.73
1938 20.61
1939 22.38
1940 23.2
1941 24.73
1942 19.02
1943 16.44
1944 14.05
1945 11.82
1946 8.639
1947 17.86
1948 25.7
1949 31.3
1950 36.88
1951 40.92
1952 36.3
1953 35.38
1954 32.75
1955 36.73
1956 39.19
1957 44.34
1958 46.87
1959 48.18
1960 52.89
1961 56.38
1962 59.92
1963 62.66
1964 70.33
1965 76.58
1966 75.47
1967 77.85
1968 73.02
1969 76.74
1970 79.32
1971 87.93
1972 94.77
1973 93.35
1974 100.6
1975 103.3
1976 109.2
1977 110.3
1978 109.1
1979 112
1980 117
1981 127
1982 128
1983 137
1984 125
1985 120.5
1986 123.5
1987 111
1988 105
1989 105.5
1990 98
1991 90
1992 93
1993 91.5
1994 88.5
1995 62.5
1996 56
1997 59
1998 61.5
1999 52
2000 48