Year Kilotonnes
1850 0.00481
1851 0.0054
1852 0.01079
1853 0.01611
1854 0.02138
1855 0.02674
1856 0.03251
1857 0.03822
1858 0.04331
1859 0.04883
1860 0.0542
1861 0.06393
1862 0.06462
1863 0.06835
1864 0.07448
1865 0.07562
1866 0.08441
1867 0.09593
1868 0.07935
1869 0.1094
1870 0.1205
1871 0.1627
1872 0.1689
1873 0.1591
1874 0.1875
1875 0.2232
1876 0.2725
1877 0.2719
1878 0.3611
1879 0.3712
1880 0.4331
1881 0.4546
1882 0.4831
1883 0.547
1884 0.5357
1885 0.574
1886 0.598
1887 0.5895
1888 0.6767
1889 0.7946
1890 0.7721
1891 0.8203
1892 0.8799
1893 0.9977
1894 1.096
1895 1.201
1896 1.24
1897 1.429
1898 1.603
1899 1.886
1900 2.141
1901 2.165
1902 2.118
1903 2.223
1904 2.433
1905 2.223
1906 2.532
1907 2.913
1908 2.963
1909 3.074
1910 2.989
1911 3.263
1912 3.555
1913 4.117
1914 3.434
1915 3.073
1916 3.377
1917 3.044
1918 1.237
1919 0.947
1920 0.8638
1921 0.9465
1922 1.173
1923 1.306
1924 1.637
1925 1.675
1926 2.526
1927 3.197
1928 3.558
1929 4.071
1930 4.965
1931 5.903
1932 6.496
1933 7.5
1934 9.176
1935 10.63
1936 12.38
1937 12.73
1938 13.51
1939 14.8
1940 16.65
1941 16.41
1942 16.18
1943 15.95
1944 15.7
1945 15.47
1946 16.98
1947 18.84
1948 21.22
1949 23.61
1950 25.97
1951 27.96
1952 29.78
1953 31.41
1954 34.13
1955 38.21
1956 41.6
1957 44.29
1958 46.1
1959 46.94
1960 47.59
1961 47.19
1962 48.37
1963 49.2
1964 50.92
1965 53.28
1966 54.34
1967 55.69
1968 55.99
1969 57.19
1970 58.93
1971 60.26
1972 61.83
1973 63.51
1974 65.8
1975 67.77
1976 68.07
1977 69.74
1978 70.41
1979 70.01
1980 70.5
1981 55.35
1982 50.65
1983 55.15
1984 48.45
1985 50.1
1986 55.6
1987 55.3
1988 52.05
1989 31.35
1990 36
1991 29.75
1992 22.05
1993 2.75
1994 2.1
1995 1.25
1996 0.75
1997 0.2
1998 1.655
1999 0.42
2000 4.201