Year Kilotonnes
1850 0.00348
1851 0.0039
1852 0.0078
1853 0.01165
1854 0.01545
1855 0.01933
1856 0.0235
1857 0.02763
1858 0.03131
1859 0.0353
1860 0.03918
1861 0.04621
1862 0.04672
1863 0.04941
1864 0.05384
1865 0.05467
1866 0.06102
1867 0.06935
1868 0.05736
1869 0.07907
1870 0.08709
1871 0.1176
1872 0.1221
1873 0.115
1874 0.1356
1875 0.1613
1876 0.197
1877 0.1965
1878 0.2611
1879 0.2684
1880 0.3131
1881 0.3287
1882 0.3492
1883 0.3954
1884 0.3872
1885 0.415
1886 0.4323
1887 0.4261
1888 0.4892
1889 0.5745
1890 0.5582
1891 0.593
1892 0.6361
1893 0.7212
1894 0.7924
1895 0.8683
1896 0.8967
1897 1.033
1898 1.159
1899 1.364
1900 1.548
1901 1.565
1902 1.531
1903 1.607
1904 1.759
1905 1.607
1906 1.831
1907 2.106
1908 2.142
1909 2.222
1910 2.161
1911 2.359
1912 2.57
1913 2.976
1914 2.483
1915 2.221
1916 2.441
1917 2.201
1918 0.8946
1919 0.6846
1920 0.6244
1921 0.6842
1922 0.8477
1923 0.9445
1924 1.183
1925 1.211
1926 1.826
1927 2.311
1928 2.572
1929 2.943
1930 3.589
1931 4.267
1932 4.696
1933 5.422
1934 6.634
1935 7.687
1936 8.95
1937 9.203
1938 9.77
1939 10.7
1940 12.04
1941 11.86
1942 11.7
1943 11.53
1944 11.35
1945 11.18
1946 12.27
1947 13.62
1948 15.34
1949 17.07
1950 18.77
1951 20.21
1952 21.53
1953 22.71
1954 24.67
1955 27.62
1956 30.07
1957 32.02
1958 33.32
1959 33.93
1960 34.4
1961 34.12
1962 34.97
1963 35.57
1964 36.81
1965 38.51
1966 39.28
1967 40.26
1968 40.48
1969 41.35
1970 42.6
1971 43.56
1972 44.7
1973 45.91
1974 47.57
1975 48.99
1976 49.21
1977 50.42
1978 50.9
1979 50.61
1980 50.97
1981 51.12
1982 49.06
1983 46.68
1984 48.3
1985 46.73
1986 47.35
1987 47.11
1988 48.41
1989 49.31
1990 47.67
1991 35.56
1992 29.55
1993 28.84
1994 35.32
1995 27.27
1996 25.44
1997 19.3
1998 17.8
1999 14.75
2000 8.332