residential mortgage backed securities market

--$5.4 tril in June 2006, larger than $4.8 tril US Treasury securities market. --$7.9 tril one to four family residential mortgages were outstanding, with about 56% held in the form of MBS. --approximately 8% of mortages outstanding are government insured, 17% in 1990. --in 2003, subprime mortgages constituted about 27% of the number of residential mortgages outstanding but only 9% of the dollar amount of mortgage origination.