Membership of the single european currency area - the Euro Zone - is required for nations entering the European Union but they must first meet the convergence criteria set out for participating nations and then make a final decision on whether or not the time is right to join.
Here are the countries that have joined the Euro in the years following the launch of the Euro (1999) and the introduction of Euro notes and coins in common circulation (2002)
As of January 2015, there are 19 member nations inside the Euro
So what of the remaining EU countries?
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