Year Tonnes
1867 168.682
1868 84.341
1869 194.351
1870 201.685
1871 297.027
1872 176.016
1873 194.351
1874 150.347
1875 165.015
1879 3.667
1883 3.667
1888 3.667
1892 370.367
1893 326.363
1894 333.697
1895 311.695
1896 374.034
1897 363.033
1898 462.042
1899 242.022
1900 418.038
1901 418.038
1902 333.697
1903 399.703
1904 355.699
1905 278.692
1906 260.357
1907 429.039
1908 729.733
1909 561.051
1910 718.732
1911 905.749
1913 1338.455
1914 11.001
1915 22.002
1916 66.006
1917 91.675
1918 124.678
1919 106.343
1920 678.395
1921 744.401
1922 678.395
1923 920.417
1924 1298.118
1925 1980.18
1926 1822.499
1927 2317.544
1928 2376.216
1929 2706.246
1930 2856.593
1931 2731.915
1932 2684.244
1933 2302.876
1934 2834.591
1935 2915.265
1936 3369.973
1937 3589.993
1938 2845.592
1939 253.023
1940 238.355
1941 135.679
1942 227.354
1943 212.686
1944 110.01
1945 66.006
1946 124.678
1947 168.682
1948 1353.123
1949 1642.816
1950 4132.709
1951 4580.083
1952 4803.77
1953 4891.778
1954 5089.796
1955 5962.542
1956 6296.239
1957 6824.287
1958 7458.678
1959 8133.406
1960 9405.855
1961 9823.893
1962 10164.924
1963 12258.781
1964 13223.202
1965 17025.881
1966 18650.362
1967 19534.109
1968 22321.029
1969 25474.649
1970 24165.53
1971 27814.195
1972 31572.87
1973 37256.72
1974 36218.959
1975 38873.867
1976 42911.234
1977 46999.939
1978 48081.704
1979 51293.996
1980 51429.675
1981 50721.944
1982 52148.407
1983 55544.049
1984 57054.853
1985 60600.842
1986 59130.375
1987 63472.103
1988 67989.847
1989 74183.41
1990 74278.752
1991 74062.399
1992 75499.863
1993 75712.549
1994 77909.082
1995 78781.828
1996 80241.294
1997 83717.61
1998 87751.31
1999 86636.542
2000 91616.328
2001 93805.527
2002 93669.848
2003 95738.036
2004 97149.831
2005 98675.303
2006 97285.51
2007 98246.264
2008 95965.39
2009 91942.691
2010 83856.956
2011 79841.591
2012 80043.276
2013 69482.316
2014 67318.786