Year Kilotonnes
1850 0.01638
1851 0.01838
1852 0.03672
1853 0.05485
1854 0.07279
1855 0.09105
1856 0.1107
1857 0.1301
1858 0.1475
1859 0.1663
1860 0.1845
1861 0.2177
1862 0.22
1863 0.2327
1864 0.2536
1865 0.2575
1866 0.2874
1867 0.3266
1868 0.2702
1869 0.3724
1870 0.4102
1871 0.5539
1872 0.5751
1873 0.5417
1874 0.6385
1875 0.7599
1876 0.9277
1877 0.9256
1878 1.23
1879 1.264
1880 1.475
1881 1.548
1882 1.645
1883 1.862
1884 1.824
1885 1.954
1886 2.036
1887 2.007
1888 2.304
1889 2.706
1890 2.629
1891 2.793
1892 2.996
1893 3.397
1894 3.732
1895 4.089
1896 4.223
1897 4.864
1898 5.459
1899 6.422
1900 7.29
1901 7.372
1902 7.211
1903 7.57
1904 8.282
1905 7.568
1906 8.622
1907 9.918
1908 10.09
1909 10.47
1910 10.18
1911 11.11
1912 12.11
1913 14.02
1914 11.69
1915 10.46
1916 11.5
1917 10.36
1918 4.213
1919 3.224
1920 2.941
1921 3.223
1922 3.992
1923 4.448
1924 5.573
1925 5.701
1926 8.601
1927 10.88
1928 12.11
1929 13.86
1930 16.91
1931 20.1
1932 22.12
1933 25.53
1934 31.24
1935 36.2
1936 42.15
1937 43.34
1938 46.01
1939 50.39
1940 56.7
1941 55.88
1942 55.09
1943 54.3
1944 53.47
1945 52.66
1946 57.8
1947 64.16
1948 72.26
1949 80.38
1950 88.42
1951 95.19
1952 101.4
1953 106.9
1954 116.2
1955 130.1
1956 141.6
1957 150.8
1958 156.9
1959 159.8
1960 162
1961 160.7
1962 164.7
1963 167.5
1964 173.4
1965 181.4
1966 185
1967 189.6
1968 190.6
1969 194.7
1970 200.6
1971 205.2
1972 210.5
1973 216.2
1974 224
1975 230.8
1976 231.7
1977 237.4
1978 239.7
1979 238.4
1980 240
1981 223.8
1982 229.7
1983 222
1984 228
1985 280.7
1986 303
1987 312.3
1988 325.6
1989 318.9
1990 284.5
1991 195.9
1992 163.6
1993 156
1994 138
1995 120.2
1996 124.7
1997 118.2
1998 124.7
1999 121.8
2000 115.6