Final expenditure on housing is an important component of GDP. Its share of GDP for countries participating in Eurostat and OECD comparisons is usually between 8 and 12 per cent and tends to increase as GDP per capita rises. Although housing is a part of household consumption expenditure, it is not included in the cycle of price surveys for consumer goods and services described in Chapter 5. Instead it is covered by a special rent survey1 for which participating countries are not expected to collect data specifically but to extract them from existent statistical sources. The survey is organised by Eurostat and is held every year.2 Data are collected on the rents paid by tenants and on the rents imputed to owner-occupiers for a set of broadly-defined dwellings. Quantity and quality data on the housing stock are also collected.