A  graphic presentation of statics of Hong Kong  Housing Authority 2011 based on population, land domestic households, average domestic household size, stock of permanent residential flats and production of permanent residential flat. Elderly Households refer to households with all household members aged 60 or above. Floor Area of HA rental flats and HOS/PSPS/MIHS flats (exclude flats put up for sale but not yet completed and flats completed but not yet put up for sale) is expressed in internal floor area and saleable area respectively. Internal floor area refers to area of a flat measured to the internal face of the flat’s enclosing and / or party walls. Saleable area refers to area of a flat measured to the external face of the flat’s enclosing walls and to the centre line of the flat’s party walls.