Foreclosure rates in Greater Des Moines decreased in January over the same period last year, according to real estate research firm CoreLogic Inc. The foreclosure rate among outstanding mortgage loans was 2.35 percent in January, down from 2.64 percent in January 2012. Foreclosure activity also was lower than the national foreclosure rate of 2.9 percent in January. The mortgage delinquency rate also dropped, with 4.3 percent of mortgage loans being 90 days or more delinquent, compared with 4.86 in the year-ago period.