Introduction Key available data are presented on population and housing based on the decennial census rounds 1981-2011. Separate tables cover: - Population by sex and major age group - Population by educational attainment - Population by activity status - Population by citizenship - Households by household size - Occupied conventional dwellings by number of rooms Data availability varies between census rounds. The countries covered by the data vary between different census rounds. There are also differences in definitions and disaggregations between countries and between census rounds.