The value of the United States dollar in circulation increased by 42% from 2007 to 2012.[7] The value of pound sterling banknotes in circulation increased by 29% from 2008 to 2013.[8] The value of the euro in circulation increased by 34% from August 2008 to August 2013 (2% of the increase was due to the adoption of euro in Slovakia 2009 and in Estonia 2011).[9]