Mortgage rates for the past 52 weeks, at a glance (AP)

The average rate on the 30-year fixed mortgage fell this week to 4.15 percent, its lowest level on records dating back to 1971, Freddie Mac said Thursday. The average rate on the 15-year fixed mortgage dropped to 3.36 percent, hitting a record low for the third straight week.Here's a look at rates for fixed and adjustable mortgages over the past 52 weeks:Current week's average Last week's average 52-week high 52-week low30-year fixed 4.15 4.32 5.05 4.1515-year fixed 3.36 3.50 4.29 3.365-year adjustable 3.08 3.13 3.92 3.081-year adjustable 2.86 2.89 3.53 2.86

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