Year Kilotonnes
1850 0.00039
1851 0.00039
1852 0.00078
1853 0.00116
1854 0.00155
1855 0.00194
1856 0.00233
1857 0.00272
1858 0.00311
1859 0.0035
1860 0.00389
1861 0.00773
1862 0.01157
1863 0.01541
1864 0.01925
1865 0.0231
1866 0.02694
1867 0.03078
1868 0.03462
1869 0.03847
1870 0.04231
1871 0.04615
1872 0.05016
1873 0.05416
1874 0.05816
1875 0.06216
1876 0.06617
1877 0.07017
1878 0.07417
1879 0.07818
1880 0.08218
1881 0.09306
1882 0.08676
1883 0.08732
1884 0.08789
1885 0.09671
1886 0.1055
1887 0.1144
1888 0.1236
1889 0.1374
1890 0.1452
1891 0.1223
1892 0.1578
1893 0.1379
1894 0.1714
1895 0.1513
1896 0.1702
1897 0.1917
1898 0.1983
1899 0.2
1900 0.2389
1901 0.2603
1902 0.1372
1903 0.1502
1904 0.1784
1905 0.1938
1906 0.1894
1907 0.2051
1908 0.269
1909 0.2465
1910 0.2942
1911 0.2556
1912 0.2929
1913 0.3347
1914 0.3618
1915 0.4137
1916 0.4549
1917 0.3907
1918 0.4194
1919 0.4589
1920 0.4815
1921 0.6606
1922 0.681
1923 0.8343
1924 0.8804
1925 0.8724
1926 0.8566
1927 0.9367
1928 0.9719
1929 1.093
1930 1.19
1931 0.9811
1932 0.818
1933 0.9872
1934 1.191
1935 1.277
1936 1.324
1937 1.687
1938 1.621
1939 1.727
1940 1.606
1941 1.656
1942 1.688
1943 1.693
1944 1.645
1945 1.631
1946 1.58
1947 1.67
1948 1.943
1949 2.011
1950 2.102
1951 2.094
1952 2.306
1953 2.412
1954 2.478
1955 2.616
1956 2.886
1957 2.952
1958 3.017
1959 3.143
1960 2.915
1961 3.059
1962 3.181
1963 3.079
1964 3.505
1965 3.822
1966 11.24
1967 12.42
1968 12.78
1969 13.95
1970 13.06
1971 12.02
1972 14.43
1973 14.66
1974 16.93
1975 17.3
1976 17.43
1977 17.7
1978 17.25
1979 19.64
1980 22.18
1981 22.18
1982 21.63
1983 16.97
1984 16.29
1985 18.8
1986 21.93
1987 19.43
1988 24.47
1989 24.16
1990 21.8
1991 22.4
1992 25.61
1993 23.14
1994 22.86
1995 22.94
1996 22.65
1997 23.45
1998 23.41
1999 22.84
2000 24.39