Mortgage rates rose this week to the highest level in a year, mortgage buyer Freddie Mac said Thursday. Freddie Mac's latest Primary Mortgage Market Survey, released Thursday, showed the average rate on the benchmark 30-year fixed mortgage climbed to 6.66% from last week's reading of 6.58%. The average rate on a 30-year loan was 6.72% a year ago. "The housing market continues to benefit from more available inventory, providing prospective homebuyers with additional options and helping support buyer activity ...