Mortgage rates went down slightly last week.  Freddie Mac reported the following national averages for  mortgage rates for the week ending March 6:

• 30-year fixed-rate mortgages: averaged 4.28 percent, with an average 0.7 point, dropping from last week’s 4.37 percent average. Last year at this time, 30-year rates averaged 3.52 percent.
• 15-year fixed-rate mortgages: averaged 3.32 percent this week, with an average 0.6 point, dropping from last week’s 3.39 percent average. A year ago at this time, 15-year rates averaged 2.76 percent.
• 5-year hybrid adjustable-rate mortgages: averaged 3.03 percent, with an average 0.4 point, dropping from last week’s 3.05 percent average. Last year at this time, 5-year ARMs averaged 2.63 percent.
• 1-year ARMs: averaged 2.52 percent, with an average 0.3 point, holding steady from last week. A year ago, 1-year ARMs averaged 2.63 percent.