National averages on fixed-rate mortgages inched down this week, keeping borrowing costs near historic lows, Freddie Mac reports in its weekly mortgage market survey.

Freddie reports the following national averages with mortgage rates for the week ending July 17:

• 30-year fixed-rate mortgages: averaged 4.13 percent, with an average 0.6 point, dropping from last week's 4.15 percent average. Last year at this time, 30-year rates averaged 4.37 percent.
• 15-year fixed-rate mortgages: averaged 3.23 percent, with an average 0.5 point, dropping from last week's 3.24 percent average. A year ago, 15-year rates averaged 3.41 percent.
• 5-year hybrid adjustable-rate mortgages: averaged 2.97 percent, with an average 0.4 point, dropping from last week's 2.99 percent average. Last year at this time, 5-year ARMs averaged 3.17 percent.
• 1-year ARMs: averaged 2.39 percent, with an average 0.4 point, dropping from last week's 2.40 percent average. A year ago, 1-year ARMs averaged 2.66 percent.

Source: Freddie Mac