Year Kilotonnes
1850 0.00165
1851 0.00165
1852 0.0033
1853 0.00495
1854 0.0066
1855 0.00825
1856 0.0099
1857 0.01156
1858 0.01321
1859 0.01487
1860 0.01653
1861 0.03286
1862 0.04918
1863 0.06551
1864 0.08185
1865 0.09818
1866 0.1145
1867 0.1308
1868 0.1472
1869 0.1635
1870 0.1799
1871 0.1962
1872 0.2132
1873 0.2302
1874 0.2472
1875 0.2642
1876 0.2813
1877 0.2983
1878 0.3153
1879 0.3323
1880 0.3494
1881 0.3956
1882 0.3688
1883 0.3712
1884 0.3736
1885 0.4111
1886 0.4486
1887 0.4861
1888 0.5253
1889 0.5839
1890 0.6173
1891 0.52
1892 0.6709
1893 0.586
1894 0.7285
1895 0.6431
1896 0.7233
1897 0.8151
1898 0.8428
1899 0.8502
1900 1.016
1901 1.106
1902 0.5832
1903 0.6385
1904 0.7583
1905 0.8236
1906 0.8052
1907 0.872
1908 1.143
1909 1.048
1910 1.25
1911 1.087
1912 1.245
1913 1.423
1914 1.538
1915 1.758
1916 1.934
1917 1.661
1918 1.783
1919 1.951
1920 2.047
1921 2.808
1922 2.895
1923 3.546
1924 3.742
1925 3.708
1926 3.642
1927 3.982
1928 4.131
1929 4.647
1930 5.06
1931 4.171
1932 3.477
1933 4.196
1934 5.065
1935 5.428
1936 5.629
1937 7.172
1938 6.892
1939 7.342
1940 6.826
1941 7.038
1942 7.175
1943 7.198
1944 6.992
1945 6.933
1946 6.717
1947 7.098
1948 8.26
1949 8.55
1950 8.937
1951 8.902
1952 9.801
1953 10.25
1954 10.53
1955 11.12
1956 12.27
1957 12.59
1958 11.76
1959 11.45
1960 11.13
1961 11
1962 10.99
1963 10.98
1964 10.96
1965 10.95
1966 10.94
1967 10.93
1968 10.74
1969 10.81
1970 11.07
1971 10.53
1972 10.29
1973 10.38
1974 10.83
1975 10.76
1976 10.32
1977 11.05
1978 10.54
1979 11.2
1980 16
1981 31.49
1982 36.72
1983 31.62
1984 33.47
1985 33.73
1986 33.65
1987 32.91
1988 29.06
1989 28.32
1990 23.19
1991 23.73
1992 24.95
1993 25.14
1994 27.39
1995 25.64
1996 28.67
1997 29.32
1998 29.04
1999 26.21
2000 27.6