To ask the Scottish Executive what are the number of housing association units as a percentage of overall social housing units for rent in the following local authority areas: (a) Highland, (b) Moray, (c) Angus, (d) Aberdeenshire, (e) Eilean Siar, (f) Orkney Island, (g) Shetland Islands, (h) Scottish Borders and (i) Dumfries and Galloway.