HANOI, April 3 (Xinhua) -- Vietnam's central bank on Wednesday raised its reference exchange rate between Vietnamese dong and U.S. dollar by 7 Vietnamese dong to 22,983 Vietnamese dong per U.S. dollar.

With the current trading band of plus or minus 3 percent, the ceiling exchange rate is 23,672 Vietnamese dong per U.S. dollar, and the floor rate is 22,294 Vietnamese dong per U.S. dollar, said the State Bank of Vietnam.

Listed rates at big commercial banks remained unchanged from Tuesday. Both BIDV and Vietcombank maintained the rates at 23,150 Vietnamese dong per U.S. dollar for buying and 23,250 Vietnamese dong per U.S. dollar for selling.

Last week, the reference exchange rates saw four ups and one down with total magnitude of 26 Vietnamese dong and 3 Vietnamese dong, respectively.