Year Tonnes
1860 29.336
1861 671.061
1862 1228.445
1863 1070.764
1864 1606.146
1865 1272.449
1866 1477.801
1867 1470.467
1868 1697.821
1869 1873.837
1870 2680.577
1871 2310.21
1872 2977.604
1873 2772.252
1874 2999.606
1875 3069.279
1876 4110.707
1877 3806.346
1878 3788.011
1879 4360.063
1880 5071.461
1881 5962.542
1882 6277.904
1883 6651.938
1884 7367.003
1885 8382.762
1886 8335.091
1887 10157.59
1888 10905.658
1889 11265.024
1890 12218.444
1891 11008.334
1892 10898.324
1893 10531.624
1894 13072.855
1895 12031.427
1896 11433.706
1897 11928.751
1898 12412.795
1899 13600.903
1900 13919.932
1901 13531.23
1902 15027.366
1903 15328.06
1904 16200.806
1905 17858.29
1906 21107.252
1907 22827.075
1908 23281.783
1909 25724.005
1910 25757.008
1911 26560.081
1912 27872.867
1913 29988.726
1914 27260.478
1915 23798.83
1916 23531.139
1917 16134.8
1918 18995.06
1919 18624.693
1920 17883.959
1921 21899.324
1922 25720.338
1923 26846.107
1924 32207.261
1925 30993.484
1926 35870.594
1927 40417.674
1928 38191.805
1929 44077.34
1930 39596.266
1931 34213.11
1932 28100.221
1933 30513.107
1934 39709.943
1935 45430.463
1936 32031.245
1937 45228.778
1938 45034.427
1939 46178.531
1940 49090.129
1941 42940.57
1942 41932.145
1943 7124.981
1944 3586.326
1945 4360.063
1946 22192.684
1947 36827.681
1948 35569.9
1949 39819.953
1950 41484.771
1951 48884.777
1952 50688.941
1953 56072.097
1954 65026.911
1955 73369.336
1956 83589.265
1957 87197.593
1958 87721.974
1959 94219.898
1960 109357.274
1961 124549.655
1962 146456.313
1963 164780.312
1964 175957.328
1965 189767.25
1966 214248.142
1967 234427.643
1968 249495.346
1969 270008.544
1970 296740.974
1971 311588.657
1972 328970.237
1973 354320.208
1974 359406.337
1975 342310.783
1976 367312.389
1977 356175.71
1978 373234.594
1979 387466.221
1980 388969.691
1981 378020.029
1982 369681.271
1983 361364.515
1984 367649.753
1985 372134.494
1986 366454.311
1987 383670.876
1988 389780.098
1989 408907.17
1990 417550.289
1991 423894.199
1992 420535.227
1993 411917.777
1994 407378.031
1995 430483.798
1996 425830.375
1997 430487.465
1998 440153.677
1999 441998.178
2000 450564.29
2001 450347.937
2002 452610.476
2003 468349.24
2004 473970.751
2005 473384.031
2006 469346.664
2007 462676.391
2008 447186.983
2009 401591.505
2010 405361.181
2011 397994.178
2012 369468.585
2013 345317.723
2014 320411.459