All Censuses will collect basic demographic information on individuals including their age and sex. Most Censuses also collect a range of information about the social, economic, and cultural characteristics of individuals and households. However, there are notable differences between countries in the specific questions asked., reflecting the particular data needs and circumstances of different countries. One question that remains unasked in the UK Census, despite huge demand from Census users, is household and individual income, though this is asked in other countries, including the US. However, the UK Census is unusual in Europe in asking a question on ethnic group. Some developing countries, lacking effective systems of vital registration use the census to collect information on births and deaths.