Total U.S. money-market mutual-fund assets fell by $3.19 billion to $2.64 trillion for the week that ended Wednesday, according to the Investment Company Institute.

The seven-day average yield on money-market mutual funds was unchanged at 0.01 percent from the previous week, according to Money Fund Report, a service of iMoneyNet.

The seven-day compounded yield was flat at 0.01 percent.

The 30-day yield and the 30-day compounded yield were both unchanged at 0.01 percent, Money Fund Report said.

The online service Bankrate.com said its survey of 100 leading commercial banks, savings and loan associations and savings banks in the nation’s 10 largest markets showed the annual percentage yield available on money-market accounts was unchanged from the week before at 0.11 percent.

Bankrate.com said that the annual percentage yield available on interest-bearing checking accounts remained steady at 0.05 percent.

The annual percentage yield on six-month certificates of deposit was unchanged from a week earlier at 0.14 percent, according to Bankrate.com.

One-year CD yields were flat at 0.23 percent, two-year CD yields were unchanged at 0.37 percent and the five-year yield was unchanged at 0.80 percent, Bankrate.com said.