I can only speculate. We used seed sites from all American and European countries, including Denmark, so Danish websites should be covered. It might be the geo IP database that we use (maxmind.com), or there are really only 6 sites with more backlinks in Denmark, or Danish webmasters use other countries to host their sites.
But this makes me wonder: http://toksvaerd.net/ is number 7 on the list for Denmark. It's apparently a site for parents of school children in a small town. The site has had about 300 visits in 2010 according to their counter http://www.counter.gd/Homepage-193570.html Are there really only 6 sites with more backlinks in Denmark? http://www.seoprofiler.com/statistics/top-backlinks/denmark