Year Kilotonnes
1850 0.00148
1851 0.00148
1852 0.00297
1853 0.00445
1854 0.00594
1855 0.00743
1856 0.00892
1857 0.01041
1858 0.0119
1859 0.01339
1860 0.01488
1861 0.02959
1862 0.04429
1863 0.059
1864 0.0737
1865 0.08841
1866 0.1031
1867 0.1178
1868 0.1325
1869 0.1473
1870 0.162
1871 0.1767
1872 0.192
1873 0.2073
1874 0.2226
1875 0.238
1876 0.2533
1877 0.2686
1878 0.2839
1879 0.2993
1880 0.3146
1881 0.3562
1882 0.3321
1883 0.3343
1884 0.3365
1885 0.3702
1886 0.404
1887 0.4377
1888 0.473
1889 0.5258
1890 0.5559
1891 0.4683
1892 0.6042
1893 0.5277
1894 0.656
1895 0.5792
1896 0.6514
1897 0.734
1898 0.759
1899 0.7656
1900 0.9147
1901 0.9963
1902 0.5252
1903 0.575
1904 0.6829
1905 0.7417
1906 0.7251
1907 0.7853
1908 1.03
1909 0.9438
1910 1.126
1911 0.9785
1912 1.121
1913 1.281
1914 1.385
1915 1.584
1916 1.742
1917 1.496
1918 1.606
1919 1.757
1920 1.843
1921 2.529
1922 2.607
1923 3.194
1924 3.37
1925 3.339
1926 3.279
1927 3.586
1928 3.72
1929 4.185
1930 4.556
1931 3.756
1932 3.131
1933 3.779
1934 4.561
1935 4.888
1936 5.069
1937 6.459
1938 6.207
1939 6.611
1940 6.147
1941 6.338
1942 6.461
1943 6.482
1944 6.297
1945 6.244
1946 6.049
1947 6.392
1948 7.438
1949 7.7
1950 8.048
1951 8.017
1952 8.826
1953 9.234
1954 9.487
1955 10.02
1956 11.05
1957 11.3
1958 11.55
1959 12.03
1960 11.16
1961 11.71
1962 12.18
1963 11.79
1964 13.42
1965 14.63
1966 14.56
1967 14.16
1968 15.26
1969 14.87
1970 15.65
1971 16.21
1972 14.67
1973 10.68
1974 12.03
1975 12.04
1976 11.91
1977 13.01
1978 15.65
1979 17.24
1980 16.22
1981 16.6
1982 16.86
1983 15.29
1984 11.84
1985 12.85
1986 13.45
1987 13.64
1988 14.65
1989 14.05
1990 14.22
1991 14.64
1992 13.14
1993 13.44
1994 14.32
1995 15.01
1996 15.44
1997 16.06
1998 18.46
1999 18.22
2000 17.78