Year Kilotonnes
1850 0.07179
1851 0.04789
1852 0.0901
1853 0.08111
1854 0.1006
1855 0.09726
1856 0.1338
1857 0.1532
1858 0.1613
1859 0.1523
1860 0.2173
1861 0.2139
1862 0.239
1863 0.2129
1864 0.2721
1865 0.2687
1866 0.2255
1867 0.2847
1868 0.2756
1869 0.3348
1870 0.2973
1871 0.2711
1872 0.3302
1873 0.2931
1874 0.3299
1875 0.3326
1876 0.3578
1877 0.3147
1878 0.3399
1879 0.3309
1880 0.2993
1881 0.3027
1882 0.3331
1883 0.248
1884 0.3292
1885 0.3042
1886 0.2838
1887 0.241
1888 0.2941
1889 0.2354
1890 0.2574
1891 0.2399
1892 0.2734
1893 0.304
1894 0.3166
1895 0.3202
1896 0.3245
1897 0.3267
1898 0.3945
1899 0.4311
1900 0.47
1901 0.6149
1902 1.247
1903 1.894
1904 2.541
1905 3.179
1906 3.731
1907 4.315
1908 5.094
1909 5.753
1910 6.404
1911 6.866
1912 12.81
1913 20.09
1914 22.93
1915 25.01
1916 27.6
1917 34.94
1918 37.32
1919 42.56
1920 49.32
1921 51.81
1922 53.34
1923 51.2
1924 51.23
1925 48.38
1926 44.31
1927 37.66
1928 88.41
1929 107.4
1930 132.5
1931 109
1932 104.9
1933 110.1
1934 122.1
1935 138.3
1936 149.7
1937 180.6
1938 182.8
1939 178.7
1940 149.1
1941 191.2
1942 105.7
1943 172.8
1944 227.9
1945 272.1
1946 299.2
1947 339.7
1948 357.5
1949 380.1
1950 408.3
1951 449.5
1952 424.2
1953 386.3
1954 396.9
1955 388.9
1956 366.7
1957 310.3
1958 266.3
1959 271.9
1960 257.1
1961 248
1962 229.8
1963 223.3
1964 214.7
1965 199.1
1966 185.2
1967 198.5
1968 188.5
1969 184.5
1970 204.4
1971 167.5
1972 156.5
1973 178.7
1974 182.8
1975 110.6
1976 139
1977 121.3
1978 117
1979 105.3
1980 143.6
1981 116.5
1982 95.47
1983 74.53
1984 65.68
1985 28.63
1986 26.67
1987 32.3
1988 34.28
1989 34.76
1990 37.48
1991 38.16
1992 38.89
1993 39.67
1994 40.45
1995 41.24
1996 42.05
1997 42.86
1998 43.68
1999 44.49
2000 45.31