To help compare sizes of different surface areas, we list here areas of the order of 1018 square metres, i.e. those between 1 trillion km2 and 10 trillion km2. See alsoareas of other orders of magnitude.
... of all households are made up of individuals and 3.4% have someone living alone who is 65 years of age or older. The average household size is 3.19 and the average family ...