Mortgage foreclosures and delinquencies have dropped over the past year in Greater Des Moines, real estate analytics firm CoreLogic Inc. said. Two percent of all outstanding mortgages were in foreclosure  in April, down from 2.63 percent in April 2012. The national foreclosure rate was 2.65 percent in April. Metro area mortgages that were at least 90 days delinquent dropped to 3.92 percent in April, down from 4.57 percent a year ago, CoreLogic said in a release.