According to data & statistics from Fannie Mae the amount of mortgage delinquencies on single family home mortgages have more than tripled from early 2005 (0.64% in 2/2005) to the end of 2008 (2.13% seriously delinquent in 11/2008).
The chart below looks at conventional single-family mortgages that are three months ore more past-due or in foreclosure as a percent of the total number of conventional single family mortgages.
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The figures for Credit Enhanced Fannie Mae mortgages is worse than average with a serious delinquency rate of 5.69% in November 2008 (and rising). (These are loans with Private Mortgage Insurance (PMI) or some other type of credit enhancement).