The interest rate for a 30-year, fixed-rate mortgage fell last week, continuing a trend of sub-4% interest rates, according to a new report from Zillow (Z). 

Current rate borrowers were quoted an average interest rate of 3.72% on Zillow’s Mortgage Marketplace in the week that ended Tuesday, down from 3.73% last week.

According to Zillow’s report, the 30-year fixed mortgage fluctuated between 3.75% and 4.01% for most of last week, before falling to its current rate of 3.72%.

“Rates were volatile last week, primarily driven by low participation during the holiday-shortened week,” said Erin Lantz, vice president of mortgages at Zillow.

“Aside from Monday’s sharp decline in rates due to bad news out of Greece, we expect continued volatility this week due to limited activity as lenders and consumers focus on the New Year’s holiday.”

Zillow also reported that the 15-year fixed mortgage rate fell below 3% last week, falling to 2.98%.

Additionally, the rate for 5/1 adjustable rate mortgages was 2.83%.