Year Kilotonnes
1850 0.00786
1851 0.00881
1852 0.01761
1853 0.0263
1854 0.0349
1855 0.04366
1856 0.05307
1857 0.0624
1858 0.07071
1859 0.07972
1860 0.08849
1861 0.1044
1862 0.1055
1863 0.1116
1864 0.1216
1865 0.1235
1866 0.1378
1867 0.1566
1868 0.1295
1869 0.1786
1870 0.1967
1871 0.2656
1872 0.2758
1873 0.2597
1874 0.3062
1875 0.3644
1876 0.4448
1877 0.4439
1878 0.5896
1879 0.6061
1880 0.7071
1881 0.7423
1882 0.7886
1883 0.893
1884 0.8746
1885 0.9371
1886 0.9763
1887 0.9624
1888 1.105
1889 1.297
1890 1.261
1891 1.339
1892 1.437
1893 1.629
1894 1.79
1895 1.961
1896 2.025
1897 2.332
1898 2.618
1899 3.08
1900 3.496
1901 3.535
1902 3.458
1903 3.63
1904 3.971
1905 3.629
1906 4.134
1907 4.756
1908 4.837
1909 5.019
1910 4.88
1911 5.327
1912 5.805
1913 6.722
1914 5.607
1915 5.017
1916 5.514
1917 4.97
1918 2.02
1919 1.546
1920 1.41
1921 1.545
1922 1.914
1923 2.133
1924 2.673
1925 2.734
1926 4.124
1927 5.219
1928 5.808
1929 6.646
1930 8.106
1931 9.638
1932 10.61
1933 12.24
1934 14.98
1935 17.36
1936 20.21
1937 20.78
1938 22.06
1939 24.16
1940 27.19
1941 26.8
1942 26.42
1943 26.04
1944 25.64
1945 25.25
1946 27.72
1947 30.77
1948 34.65
1949 38.54
1950 42.4
1951 45.65
1952 48.63
1953 51.28
1954 55.71
1955 62.38
1956 67.91
1957 72.3
1958 75.26
1959 76.64
1960 77.69
1961 77.05
1962 78.98
1963 80.32
1964 83.13
1965 86.98
1966 88.71
1967 90.93
1968 91.41
1969 93.37
1970 96.21
1971 98.38
1972 100.9
1973 103.7
1974 107.4
1975 110.6
1976 111.1
1977 113.9
1978 115
1979 114.3
1980 115.1
1981 121
1982 125
1983 133.7
1984 133.3
1985 136.6
1986 127.7
1987 129.2
1988 127.7
1989 124.5
1990 124.2
1991 97
1992 67.6
1993 35.7
1994 23.45
1995 10.15
1996 15.05
1997 16.55
1998 10.09
1999 4.305
2000 4.5