Sweden, Finland, and Austria all joined the EU on January 1, 1995.
The most recent country to join was Croatia in July 2013. Before that, both Romania and Bulgaria joined in January 2007.
Greece joined what was then known as the European Economic Community in 1981. It is now called the European Union.
The newest member of the European Union is Croatia, who joined on the 1st of July 2013. Before that, Romania and Bulgaria both joined in 2007, which is probably the answer you were looking for.
There are 27 members of the European Union as of 2010. The last new members were Romania and Bulgaria who joined in 2007. See the related question below for the full list.
No new countries joined the European Union in 2005.
Romania and Bulgaria.
No new countries joined in 2002. Prior to that, the last countries to join joined in 1995. The next set of countries joined in 2004.
Countries are part of the Union. They apply to join. They are not elected to join. Countries can elect people to represent them in the European Union after they have joined.
The following 10 countries joined the European Union in 2004:Czech RepublicEstoniaHungaryLatviaLithuaniaMaltaPolandSlovakiaSlovenia
In 2004 the following 10 countries joined the European Union. Cyprus Czech Republic Estonia Hungary Latvia Lithuania Malta Poland Slovakia Slovenia
No country joined the European Union in October 2007. Two countries did join in 2007, Bulgaria and Romania, but they both joined on the 1st of January 2007.
Ten countries joined the European Union in 2004.
European Union Membership Additions in 1995:AustriaFinlandSweden
Greece joined what was then called the European Economic Community, now called the European Union, in 1981.
The Treaty of Accession for the 10 countries that joined the European Union on the 1st of May 2004 was signed on the 16th of April 2003.
As of the 27th of June 2014, one country has joined the European Union since May 2007. That was Croatia, who joined on the 1st of July 2013.