Year Kilotonnes
1850 0.0014
1851 0.0014
1852 0.00281
1853 0.00421
1854 0.00562
1855 0.00703
1856 0.00843
1857 0.00984
1858 0.01125
1859 0.01267
1860 0.01408
1861 0.02798
1862 0.04189
1863 0.0558
1864 0.06971
1865 0.08362
1866 0.09753
1867 0.1114
1868 0.1254
1869 0.1393
1870 0.1532
1871 0.1671
1872 0.1816
1873 0.1961
1874 0.2106
1875 0.2251
1876 0.2396
1877 0.2541
1878 0.2686
1879 0.2831
1880 0.2976
1881 0.337
1882 0.3141
1883 0.3162
1884 0.3182
1885 0.3502
1886 0.3821
1887 0.414
1888 0.4474
1889 0.4973
1890 0.5258
1891 0.4429
1892 0.5714
1893 0.4991
1894 0.6205
1895 0.5478
1896 0.6161
1897 0.6942
1898 0.7179
1899 0.7241
1900 0.8652
1901 0.9423
1902 0.4967
1903 0.5439
1904 0.6459
1905 0.7015
1906 0.6858
1907 0.7427
1908 0.9739
1909 0.8926
1910 1.065
1911 0.9255
1912 1.06
1913 1.212
1914 1.31
1915 1.498
1916 1.647
1917 1.415
1918 1.519
1919 1.662
1920 1.744
1921 2.392
1922 2.466
1923 3.021
1924 3.188
1925 3.159
1926 3.102
1927 3.392
1928 3.519
1929 3.958
1930 4.31
1931 3.552
1932 2.962
1933 3.574
1934 4.314
1935 4.623
1936 4.795
1937 6.109
1938 5.871
1939 6.253
1940 5.814
1941 5.995
1942 6.111
1943 6.131
1944 5.956
1945 5.905
1946 5.721
1947 6.046
1948 7.035
1949 7.283
1950 7.612
1951 7.582
1952 8.348
1953 8.734
1954 8.973
1955 9.473
1956 10.45
1957 10.69
1958 10.92
1959 11.38
1960 10.56
1961 11.07
1962 11.52
1963 11.15
1964 12.69
1965 13.84
1966 13.77
1967 13.39
1968 14.43
1969 14.06
1970 14.8
1971 15.34
1972 15.6
1973 16.91
1974 18
1975 16.29
1976 15.97
1977 17.18
1978 17.09
1979 17.93
1980 19.06
1981 18.95
1982 18.3
1983 17.16
1984 17.48
1985 17.37
1986 17.53
1987 17.7
1988 18.18
1989 18.48
1990 18.8
1991 19.27
1992 19.68
1993 20.03
1994 20.32
1995 20.56
1996 20.81
1997 21.09
1998 21.39
1999 21.71
2000 22.07