in 2006, slovenia became the 13th country to use the euro. in 2008 cyprus and malta became the 14th and 15th countries to use the euro. in 2009, slovakia became the 16th country to use the euro. in 2011, estonia became the 17th country to use the euro. in 2014, latvia became the 18th country and in 2015, lithuania became the 19th country to use the euro.