RoadRunner,
The Interbank rate is a bidirectional exchange rate with no commission or markup. (Since it is bidirectional there could not be a markup.) So 1% over the Interbank rate is 1%+0%=1%. You can find the historical Interbank rate between any set of currencies by visiting the excellent site
http://www.oanda.com/convert/fxhistory
"QuiteLion": Absolutely. Don't you?