I found and interesting website with GDPs for countries and the EU. I thought they were pretty cool. There are tons of other statistics on the website.
https://www.cia.gov/cia/publications/factbook/rankorder/2001rank.htmlThe U.S. and EU are pretty close. They're only $16 billion apart.
Top 5
0
World $ 65,000,000,000,000 2006 est. (comparison)
1
United States $ 12,980,000,000,000 2006 est. (~19.97%)
2
European Union $ 12,820,000,000,000 2006 est. (~19.72%)
3
China $ 10,000,000,000,000 2006 est. (~15.68%)
4
Japan $ 4,220,000,000,000 2006 est (~6.49%)
5
India $ 4,042,000,000,000 2006 est (~6.22%)
[Note] The CIA (Central Intelligence Agency) used purchasing power parity to take into account exchange rates.