Year Kilotonnes
1850 0
1851 0
1852 0.00001
1853 0.00001
1854 0.00001
1855 0.00002
1856 0.00002
1857 0.00002
1858 0.00003
1859 0.00003
1860 0.00003
1861 0.00004
1862 0.00004
1863 0.00004
1864 0.00005
1865 0.00005
1866 0.00005
1867 0.00006
1868 0.00006
1869 0.00006
1870 0.00007
1871 0.00007
1872 0.00007
1873 0.00008
1874 0.00008
1875 0.00008
1876 0.00009
1877 0.00009
1878 0.00009
1879 0.0001
1880 0.0001
1881 0.00016
1882 0.00021
1883 0.00027
1884 0.00032
1885 0.00038
1886 0.00043
1887 0.00049
1888 0.00054
1889 0.0006
1890 0.00065
1891 0.00068
1892 0.00071
1893 0.00072
1894 0.00073
1895 0.00072
1896 0.00103
1897 0.00133
1898 0.00163
1899 0.00196
1900 0.00228
1901 0.00274
1902 0.00426
1903 0.00601
1904 0.01027
1905 0.00936
1906 0.01085
1907 0.01291
1908 0.0144
1909 0.01532
1910 0.01584
1911 0.01695
1912 0.0213
1913 0.02426
1914 0.01903
1915 0.01421
1916 0.02373
1917 0.0222
1918 0.02005
1919 0.01525
1920 0.01831
1921 0.01801
1922 0.02158
1923 0.0246
1924 0.02595
1925 0.02583
1926 0.03318
1927 0.03234
1928 0.03229
1929 0.03148
1930 0.02946
1931 0.0294
1932 0.04714
1933 0.06408
1934 0.6248
1935 2.771
1936 10.17
1937 17
1938 18.15
1939 16.63
1940 15.49
1941 14.87
1942 13.64
1943 14.34
1944 14.57
1945 15.78
1946 16.97
1947 19.76
1948 22.68
1949 22.5
1950 110.2
1951 127.5
1952 132.5
1953 136.2
1954 140.4
1955 126.4
1956 114.9
1957 98.52
1958 100.4
1959 95.01
1960 98.48
1961 96.12
1962 98.82
1963 91.13
1964 77.79
1965 68.67
1966 67.02
1967 84.26
1968 78.45
1969 75.83
1970 80.98
1971 78.24
1972 69.4
1973 72.33
1974 78.32
1975 67.57
1976 63.67
1977 81.85
1978 74.3
1979 76
1980 80.21
1981 83.77
1982 55.73
1983 44.24
1984 51.38
1985 45.14
1986 57.87
1987 61.02
1988 60.09
1989 58.7
1990 58.06
1991 50.18
1992 48.47
1993 46.96
1994 46.36
1995 48.98
1996 49.45
1997 50.61
1998 51.1
1999 51.63
2000 51.49