Due to the difficulty in streamlining information from provincial to federal level, the CDDA in Austria is only updated every 3 to 5 years. The next complete update will be done in June 2012. Figures used are thus subject to further completeness
The surface area which is taken into account is the one at the year of designation of a site, it may have changed later on (decrease or increase) but this is not reflected in the diagramme
