Nevertheless, as the author himself has emphasized in his preface, the opinions expressed in this document are strictly his own, and are in no way to be taken as those of the national statistical services or of the Commission of the European Communities. ###>Cependant, comme le souligne l'auteur dans sa propre préface, les opinions exprimées dans ce document sont les siennes propres et n'engagent ni les services statistiques nationaux ni la Commission des Communautés européennes.