English: Graph of the official exchange rate of key foreign currencies vs. the Belarusian Ruble (BYR) 1.1.2008-8.7.2011 . US dollar (USD), euro (EUR) and Russian ruble (RUB) are the three most important foreign currencies used in the Belarusian economy. The exchange rate shown is that available from the National Bank of the Republic of Belarus (http://www.nbrb.by/engl/statistics/Rates/RatesDaily.asp). Note the strong devalvation in May 2011.