The United Kingdom joined the Common Market in 1973.
Actually, it was in 2004. The following countries joined the EU.CyprusCzech RepublicHungaryEstoniaLatviaLithuaniaMaltaPolandSloveniaSlovakia
Hungary joined the EU in 2004, but has not yet joined the Euro currency.
No countries joined the EU in 2008. 10 countries joined in 2004. See the related question below.
Bulgaria has not yet joined the Euro zone, it joined the EU in January 2007.
yes
Sweden joined the EU in the year of 1995.
Finland joined the EU in the 1995.
No new country joined the EU in 1999.
On the 1st May 2004 Hungary joined the EU (European Union)
Malta joined the European Union on the 1st of May in 2004.
No. Switzerland has not joined the EU since a referendum on the matter was defeated.
Croatia joined the EU on July 1st, 2013.