Finland took the euro at its launch and sends fifteen members to the European Parliament
Background
The European Union's own country page records that Finland has been a member state since 1 January 1995. It has been in the euro area since 1 January 1999, the date the single currency was launched, and in the Schengen area since 25 March 2001. Finland is a parliamentary republic with a president as head of state and a prime minister as head of government. The country sends 15 representatives to the European Parliament. Its geographical size is given as 338 363 square kilometres and its population as 5 635 971. Finland is the only Nordic country that uses the euro.
In plain words
Euro area The group of European Union member states that use the euro — Also called the eurozone; its monetary policy is set by the European Central Bank.
Schengen area The area of European states without internal border checks — Travellers move between member states without passport checks at the internal borders.