Year Kilotonnes
1850 0.00194
1851 0.00194
1852 0.00389
1853 0.00583
1854 0.00778
1855 0.00972
1856 0.01167
1857 0.01362
1858 0.01558
1859 0.01753
1860 0.01949
1861 0.03873
1862 0.05798
1863 0.07723
1864 0.09649
1865 0.1157
1866 0.135
1867 0.1543
1868 0.1735
1869 0.1928
1870 0.212
1871 0.2313
1872 0.2513
1873 0.2714
1874 0.2915
1875 0.3115
1876 0.3316
1877 0.3516
1878 0.3717
1879 0.3918
1880 0.4118
1881 0.4664
1882 0.4348
1883 0.4376
1884 0.4405
1885 0.4847
1886 0.5289
1887 0.5731
1888 0.6192
1889 0.6883
1890 0.7277
1891 0.613
1892 0.7909
1893 0.6909
1894 0.8588
1895 0.7582
1896 0.8527
1897 0.9609
1898 0.9936
1899 1.002
1900 1.197
1901 1.304
1902 0.6875
1903 0.7527
1904 0.8939
1905 0.971
1906 0.9492
1907 1.028
1908 1.348
1909 1.235
1910 1.474
1911 1.281
1912 1.468
1913 1.677
1914 1.813
1915 2.073
1916 2.28
1917 1.958
1918 2.102
1919 2.3
1920 2.413
1921 3.311
1922 3.413
1923 4.181
1924 4.412
1925 4.372
1926 4.293
1927 4.694
1928 4.87
1929 5.479
1930 5.965
1931 4.917
1932 4.099
1933 4.947
1934 5.971
1935 6.398
1936 6.636
1937 8.455
1938 8.125
1939 8.655
1940 8.047
1941 8.298
1942 8.459
1943 8.485
1944 8.243
1945 8.174
1946 7.919
1947 8.368
1948 9.737
1949 10.08
1950 10.54
1951 10.49
1952 11.55
1953 12.09
1954 12.42
1955 13.11
1956 14.46
1957 14.8
1958 15.12
1959 15.75
1960 14.61
1961 15.33
1962 15.94
1963 15.43
1964 17.57
1965 19.16
1966 19.06
1967 18.54
1968 19.97
1969 19.46
1970 20.48
1971 21.23
1972 21.6
1973 23.41
1974 24.91
1975 22.54
1976 22.1
1977 23.77
1978 23.65
1979 24.65
1980 25.69
1981 26.23
1982 25.6
1983 25.24
1984 25.45
1985 25.55
1986 25.55
1987 26.15
1988 26.03
1989 26.15
1990 25.39
1991 25.6
1992 25.81
1993 26.02
1994 26.24
1995 26.45
1996 26.67
1997 26.89
1998 27.11
1999 27.33
2000 27.56