Year Kilotonnes
1850 0.01051
1851 0.01179
1852 0.02356
1853 0.03519
1854 0.0467
1855 0.05842
1856 0.07101
1857 0.08348
1858 0.09461
1859 0.1067
1860 0.1184
1861 0.1396
1862 0.1412
1863 0.1493
1864 0.1627
1865 0.1652
1866 0.1844
1867 0.2096
1868 0.1733
1869 0.2389
1870 0.2632
1871 0.3553
1872 0.369
1873 0.3475
1874 0.4096
1875 0.4875
1876 0.5952
1877 0.5939
1878 0.7888
1879 0.8109
1880 0.946
1881 0.9931
1882 1.055
1883 1.195
1884 1.17
1885 1.254
1886 1.306
1887 1.288
1888 1.478
1889 1.736
1890 1.687
1891 1.792
1892 1.922
1893 2.179
1894 2.394
1895 2.624
1896 2.709
1897 3.121
1898 3.503
1899 4.12
1900 4.677
1901 4.73
1902 4.627
1903 4.857
1904 5.314
1905 4.856
1906 5.531
1907 6.363
1908 6.472
1909 6.715
1910 6.53
1911 7.128
1912 7.766
1913 8.993
1914 7.502
1915 6.712
1916 7.377
1917 6.65
1918 2.703
1919 2.069
1920 1.887
1921 2.068
1922 2.561
1923 2.854
1924 3.576
1925 3.658
1926 5.518
1927 6.983
1928 7.771
1929 8.892
1930 10.85
1931 12.89
1932 14.19
1933 16.38
1934 20.04
1935 23.23
1936 27.04
1937 27.81
1938 29.52
1939 32.33
1940 36.38
1941 35.85
1942 35.34
1943 34.84
1944 34.31
1945 33.79
1946 37.08
1947 41.16
1948 46.36
1949 51.57
1950 56.73
1951 61.07
1952 65.06
1953 68.61
1954 74.54
1955 83.46
1956 90.87
1957 96.74
1958 100.7
1959 102.5
1960 104
1961 103.1
1962 105.7
1963 107.5
1964 111.2
1965 116.4
1966 118.7
1967 121.7
1968 122.3
1969 124.9
1970 128.7
1971 131.6
1972 135.1
1973 138.7
1974 143.7
1975 148
1976 148.7
1977 152.3
1978 153.8
1979 152.9
1980 154
1981 152.5
1982 143.5
1983 142
1984 135
1985 141
1986 148.5
1987 158.5
1988 136.5
1989 119
1990 132.5
1991 129.9
1992 84.1
1993 78.2
1994 54.25
1995 32.03
1996 33.52
1997 18.07
1998 16.04
1999 6.025
2000 6