Year Kilotonnes
1850 0.03255
1851 0.02172
1852 0.04085
1853 0.03677
1854 0.04559
1855 0.0441
1856 0.06065
1857 0.06947
1858 0.07313
1859 0.06906
1860 0.09851
1861 0.09699
1862 0.1084
1863 0.09653
1864 0.1234
1865 0.1218
1866 0.1023
1867 0.1291
1868 0.125
1869 0.1518
1870 0.1348
1871 0.1229
1872 0.1497
1873 0.1329
1874 0.1496
1875 0.1508
1876 0.1622
1877 0.1427
1878 0.1541
1879 0.15
1880 0.1357
1881 0.1372
1882 0.151
1883 0.1125
1884 0.1492
1885 0.1379
1886 0.1287
1887 0.1093
1888 0.1334
1889 0.1067
1890 0.1167
1891 0.1088
1892 0.124
1893 0.1379
1894 0.1435
1895 0.1452
1896 0.1471
1897 0.1481
1898 0.1789
1899 0.1955
1900 0.2131
1901 0.2788
1902 0.5653
1903 0.8588
1904 1.152
1905 1.442
1906 1.692
1907 1.956
1908 2.31
1909 2.609
1910 2.903
1911 3.113
1912 5.806
1913 9.107
1914 10.4
1915 11.34
1916 12.51
1917 15.84
1918 16.92
1919 19.3
1920 22.36
1921 23.49
1922 24.19
1923 23.21
1924 23.23
1925 21.94
1926 20.09
1927 17.08
1928 40.08
1929 48.72
1930 60.09
1931 49.43
1932 47.58
1933 49.9
1934 55.34
1935 62.71
1936 67.86
1937 81.88
1938 82.89
1939 81.01
1940 67.6
1941 86.7
1942 47.94
1943 78.33
1944 103.3
1945 123.4
1946 135.7
1947 154
1948 162.1
1949 172.3
1950 185.1
1951 204.3
1952 191.1
1953 172.5
1954 175.7
1955 170.6
1956 159.5
1957 133.8
1958 113.8
1959 115.2
1960 107.9
1961 103.4
1962 98.96
1963 92.14
1964 87.81
1965 80
1966 73.05
1967 76.89
1968 71.58
1969 69.21
1970 76.21
1971 61.59
1972 56.82
1973 64.5
1974 65.1
1975 38.97
1976 48.63
1977 42.25
1978 40.74
1979 36.72
1980 50.17
1981 40.6
1982 33.3
1983 26.03
1984 22.96
1985 10.04
1986 9.378
1987 11.38
1988 12.1
1989 12.29
1990 13.23
1991 13.43
1992 13.61
1993 13.75
1994 13.9
1995 14.06
1996 14.22
1997 14.39
1998 14.58
1999 14.78
2000 15