I think this is the relevant bit,dont know where you get the 1.5%?
Speaking at the annual conference of the National Housing Federation in London today, Migrationwatch chairman, Sir Andrew Green said that in the last ten years, the number of UK born tenants in social housing in the UK has fallen by about 1.2 million while non UK-born tenants have increased by 300,000. As a result, the proportion of foreign born has increased from 7.2% to 11.1% - an increase of 54%.