Public housing estates in Hong Kong may be rented or sold under various government subsidy programmes, and are generally subject to a range of restrictions and eligibility requirements. They also vary in scale, and are built and managed under the responsibility of the Hong Kong Housing Authority and the Hong Kong Housing Society. According to the 2006 census,[1] 3.3 million people or 48.8 percent of the population of Hong Kong lived in rental or subsidised-sale public housing; within that group, 31 percent lived in public rental housing, 17.1 percent lived in Housing Authority subsidised-sale flats and 0.7 percent lived in Housing Society subsidised-sale flats