Year Tonnes
1830 18.335
1831 22.002
1832 14.668
1833 18.335
1850 113.677
1855 344.698
1858 484.044
1859 513.38
1860 678.395
1861 861.745
1862 777.404
1863 814.074
1864 913.083
1865 872.746
1866 2757.584
1867 3164.621
1868 2632.906
1869 3571.658
1870 3876.019
1871 5232.809
1872 5372.155
1873 5042.125
1874 6120.223
1875 7044.307
1876 8745.795
1877 8925.478
1878 11664.727
1879 11969.088
1880 14040.943
1881 14789.011
1882 15577.416
1883 17729.945
1884 18001.303
1885 19607.449
1886 20109.828
1887 21279.601
1888 22196.351
1889 23971.179
1890 27146.801
1891 29889.717
1892 31638.876
1893 37084.371
1894 37770.1
1895 43398.945
1896 44180.016
1897 51081.31
1898 57289.541
1899 66460.708
1900 75287.177
1901 77293.026
1902 74652.786
1903 73024.638
1904 81246.052
1905 72522.259
1906 82720.186
1907 92654.089
1908 93222.474
1909 98407.612
1910 96508.106
1911 100057.762
1912 113343.303
1913 123126.859
1914 111124.768
1915 101997.605
1916 108711.882
1917 100050.428
1918 39900.627
1919 34081.098
1920 31077.825
1921 33703.397
1922 41103.403
1923 45404.794
1924 54095.584
1925 53391.52
1926 77359.032
1927 96178.076
1928 106849.046
1929 115070.46
1930 156437.887
1931 187937.417
1932 211743.581
1933 236638.844
1934 286242.353
1935 324008.786
1936 371536.773
1937 379912.201
1938 400979.116
1939 405896.563
1940 486618.234
1941 427513.528
1942 294218.078
1943 375585.141
1944 351753.308
1945 372409.519
1946 418529.378
1947 503981.479
1948 536295.083
1949 609638.75
1950 679553.772
1951 736494.948
1952 788683.692
1953 834396.514
1954 911308.172
1955 1033349.599
1956 1132970.988
1957 1239831.035
1958 1323379.963
1959 1391373.477
1960 1448637.349
1961 1493932.133
1962 1567950.528
1963 1681524.852
1964 1788304.225
1965 1897052.777
1966 2003392.11
1967 2094843.423
1968 2153698.773
1969 2242938.885
1970 2359142.448
1971 2503944.944
1972 2634955.853
1973 2746751.682
1974 2851891.906
1975 2998311.549
1976 3113979.73
1977 3220146.714
1978 3330904.782
1979 3358623.635
1980 3491017.003
1981 3425062.341
1982 3489821.561
1983 3539850.442
1984 3571709.338
1985 3851989.149
1986 3862509.772
1987 4025232.897
1988 4135851.619
1989 4049222.411
1990 3796525.774
1991 3659317.635