HANOI, April 9 (Xinhua) -- Vietnam's central bank on Tuesday increased its reference exchange rate between Vietnamese dong and U.S. dollar by 5 Vietnamese dong to 22,993 Vietnamese dong per U.S. dollar.

With the current trading band of plus or minus 3 percent, the ceiling exchange rate is 23,683 Vietnamese dong per U.S. dollar, and the floor rate is 22,303 Vietnamese dong per U.S. dollar, the State Bank of Vietnam said.

Listed rates at big commercial banks remained unchanged from Monday. 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 two ups and two downs with total magnitude of 17 Vietnamese dong and 9 Vietnamese dong, respectively. Enditem