Year Kilotonnes
1850 0.01238
1851 0.00826
1852 0.01554
1853 0.01399
1854 0.01734
1855 0.01677
1856 0.02307
1857 0.02643
1858 0.02782
1859 0.02627
1860 0.03747
1861 0.03689
1862 0.04122
1863 0.03672
1864 0.04693
1865 0.04635
1866 0.0389
1867 0.0491
1868 0.04754
1869 0.05774
1870 0.05127
1871 0.04675
1872 0.05695
1873 0.05055
1874 0.0569
1875 0.05736
1876 0.06171
1877 0.05428
1878 0.05862
1879 0.05707
1880 0.05162
1881 0.0522
1882 0.05745
1883 0.04278
1884 0.05677
1885 0.05246
1886 0.04894
1887 0.04157
1888 0.05073
1889 0.0406
1890 0.04439
1891 0.04138
1892 0.04715
1893 0.05244
1894 0.0546
1895 0.05522
1896 0.05597
1897 0.05634
1898 0.06804
1899 0.07436
1900 0.08106
1901 0.106
1902 0.1092
1903 0.1244
1904 0.06158
1905 0.2072
1906 0.2485
1907 0.2898
1908 0.331
1909 0.3722
1910 0.4133
1911 0.4686
1912 0.5238
1913 0.579
1914 0.6322
1915 0.6975
1916 0.7852
1917 0.9514
1918 1.267
1919 1.842
1920 1.417
1921 1.519
1922 1.777
1923 2.427
1924 2.298
1925 3.225
1926 5.65
1927 8.935
1928 10.06
1929 10.52
1930 11.54
1931 12.56
1932 13.58
1933 8.896
1934 16.66
1935 18.38
1936 4.009
1937 30.15
1938 12.62
1939 24.46
1940 49.8
1941 63.13
1942 51.31
1943 48.56
1944 73.29
1945 80.24
1946 371.4
1947 99.6
1948 102.9
1949 196.2
1950 176.4
1951 218.8
1952 226.3
1953 266.7
1954 269.3
1955 313.4
1956 341.4
1957 359.8
1958 324.5
1959 375.4
1960 384.8
1961 377.3
1962 397.3
1963 415.7
1964 412.2
1965 428.9
1966 398.8
1967 420.4
1968 423.4
1969 395.3
1970 455.7
1971 409.4
1972 346.4
1973 396.4
1974 420.6
1975 301.9
1976 296.8
1977 326.5
1978 314.4
1979 324.5
1980 329.6
1981 303.5
1982 273.7
1983 242.5
1984 244.3
1985 256.3
1986 246.2
1987 242.9
1988 276.2
1989 269.8
1990 263.6
1991 283.3
1992 278.2
1993 267.2
1994 304.3
1995 295
1996 331.6
1997 319.9
1998 321.3
1999 314.2
2000 370.8