Year Kilotonnes
1850 0.00979
1851 0.01099
1852 0.02195
1853 0.03279
1854 0.04351
1855 0.05444
1856 0.06617
1857 0.07779
1858 0.08816
1859 0.09939
1860 0.1103
1861 0.1301
1862 0.1315
1863 0.1391
1864 0.1516
1865 0.1539
1866 0.1718
1867 0.1953
1868 0.1615
1869 0.2226
1870 0.2452
1871 0.3311
1872 0.3438
1873 0.3238
1874 0.3817
1875 0.4543
1876 0.5546
1877 0.5534
1878 0.735
1879 0.7557
1880 0.8815
1881 0.9254
1882 0.9832
1883 1.113
1884 1.09
1885 1.168
1886 1.217
1887 1.2
1888 1.377
1889 1.617
1890 1.572
1891 1.67
1892 1.791
1893 2.031
1894 2.231
1895 2.445
1896 2.525
1897 2.908
1898 3.264
1899 3.839
1900 4.358
1901 4.407
1902 4.311
1903 4.525
1904 4.951
1905 4.524
1906 5.154
1907 5.929
1908 6.031
1909 6.257
1910 6.085
1911 6.642
1912 7.237
1913 8.38
1914 6.991
1915 6.254
1916 6.874
1917 6.196
1918 2.519
1919 1.928
1920 1.758
1921 1.927
1922 2.387
1923 2.659
1924 3.332
1925 3.409
1926 5.142
1927 6.506
1928 7.241
1929 8.286
1930 10.11
1931 12.02
1932 13.22
1933 15.27
1934 18.68
1935 21.64
1936 25.2
1937 25.91
1938 27.51
1939 30.12
1940 33.9
1941 33.41
1942 32.93
1943 32.46
1944 31.97
1945 31.48
1946 34.55
1947 38.36
1948 43.2
1949 48.05
1950 52.86
1951 56.91
1952 60.63
1953 63.93
1954 69.46
1955 77.77
1956 84.67
1957 90.15
1958 93.83
1959 95.55
1960 96.86
1961 96.06
1962 98.46
1963 100.1
1964 103.6
1965 108.4
1966 110.6
1967 113.4
1968 114
1969 116.4
1970 120
1971 122.7
1972 125.9
1973 129.3
1974 133.9
1975 138
1976 138.5
1977 142
1978 143.3
1979 142.5
1980 143.5
1981 131.3
1982 129.2
1983 122.8
1984 118.2
1985 127
1986 128
1987 127.5
1988 127
1989 127
1990 126
1991 122.8
1992 93.7
1993 76.9
1994 74.55
1995 59.25
1996 62.6
1997 59.5
1998 55
1999 51.25
2000 47.73