Only 4% of U.S. mortgages were delinquent in March, unchanged from February and the lowest delinquency rate in 13 years, according to CoreLogic. The delinquency rate has now decreased for 15 straight months on a yearly basis. Compared with a year earlier, the delinquency rate is also down 0.3%. Meanwhile, the foreclosure inventory rate fell to 0.4%, down from 0.6% in March 2018 and a 10-year low.