Year Kilotonnes
1850 0.00146
1851 0.00146
1852 0.00293
1853 0.0044
1854 0.00587
1855 0.00734
1856 0.00881
1857 0.01028
1858 0.01175
1859 0.01323
1860 0.0147
1861 0.02923
1862 0.04375
1863 0.05827
1864 0.0728
1865 0.08733
1866 0.1019
1867 0.1164
1868 0.1309
1869 0.1454
1870 0.16
1871 0.1745
1872 0.1896
1873 0.2048
1874 0.2199
1875 0.235
1876 0.2502
1877 0.2653
1878 0.2805
1879 0.2956
1880 0.3107
1881 0.3519
1882 0.328
1883 0.3302
1884 0.3323
1885 0.3657
1886 0.399
1887 0.4324
1888 0.4672
1889 0.5194
1890 0.5491
1891 0.4625
1892 0.5968
1893 0.5213
1894 0.648
1895 0.5721
1896 0.6434
1897 0.725
1898 0.7497
1899 0.7562
1900 0.9035
1901 0.9841
1902 0.5187
1903 0.568
1904 0.6745
1905 0.7326
1906 0.7162
1907 0.7757
1908 1.017
1909 0.9322
1910 1.112
1911 0.9666
1912 1.107
1913 1.266
1914 1.368
1915 1.564
1916 1.72
1917 1.477
1918 1.586
1919 1.735
1920 1.821
1921 2.498
1922 2.575
1923 3.155
1924 3.329
1925 3.299
1926 3.239
1927 3.542
1928 3.675
1929 4.134
1930 4.501
1931 3.71
1932 3.093
1933 3.733
1934 4.505
1935 4.828
1936 5.007
1937 6.379
1938 6.131
1939 6.53
1940 6.071
1941 6.261
1942 6.382
1943 6.402
1944 6.22
1945 6.167
1946 5.975
1947 6.314
1948 7.347
1949 7.606
1950 7.949
1951 7.918
1952 8.718
1953 9.121
1954 9.37
1955 9.893
1956 10.91
1957 11.16
1958 11.41
1959 11.88
1960 11.02
1961 11.57
1962 12.03
1963 11.64
1964 13.25
1965 14.45
1966 14.38
1967 13.99
1968 15.07
1969 14.68
1970 15.45
1971 16.02
1972 16.29
1973 17.66
1974 18.8
1975 17.01
1976 16.67
1977 17.94
1978 17.85
1979 18.6
1980 19.38
1981 19.79
1982 19.32
1983 19.04
1984 19.21
1985 19.28
1986 19.28
1987 19.73
1988 19.64
1989 19.73
1990 19.16
1991 19.21
1992 19.26
1993 19.31
1994 19.36
1995 19.41
1996 19.46
1997 19.51
1998 19.56
1999 19.61
2000 19.66