This document has been produced with the financial assistance of the European Union (EU). It should not be reported as representing the official views of the EU, the OECD or its member countries, or of partners participating in the SIGMA Programme. The opinions expressed and arguments employed are those of the authors. This document, as well as any data and any map included herein, are without prejudice to the status of or sovereignty over any territory, to the delimitation of international frontiers and boundaries and to the name of any territory, city or area.