Foreclosure rates in Greater Des Moines decreased in March over the same period last year, analytics firm CoreLogic Inc. said in a release. Foreclosures among outstanding mortgage loans was 1.38 percent in March, down from 2.23 percent in March 2013. The national foreclosure rate was 1.86 percent in March. The mortgage delinquency rate also decreased, with 3.2 percent of mortgage loans  90 days or more delinquent compared with 4 percent for the same period last year.