Results of the German Survey on Volunteering have been reported in numerous publications. On this site you can find an overview of the different  publications.

 

There are various reports based on the German Survey on Volunteering 1999, 2004, 2009 and 2014 available for Germany and its federal states. You can find an overview of publications in German and in English here:
Reports

Some selected current DZA-publications on the German Survey on Volunteering can be found here (most are in German):
Selected DZA-Publications

A compilation of all publications containing analyses of the German Survey on Volunteering can be found on the site of the DZA Research Data Centre
Publications with FWS-data