WASHINGTON (AP) — The average rate on the 30-year fixed mortgage hovered above its record low for a fourth straight week. But cheap mortgage rates have done little to boost home sales or refinancing.

Freddie Mac says the rate on the 30-year fixed loan fell to 3.98 percent from 4 percent the previous week. Seven weeks ago, it dropped to a record low of 3.94 percent, according to the National Bureau of Economic Research.

The average rate on the 15-year fixed mortgage edged down to 3.3 percent from 3.31 percent. Seven weeks ago, it too hit a record low of 3.26 percent.

Rates have been below 5 percent for all but two weeks this year. Yet this year could be the worst for home sales in 14 years.