16 teams
The currency used in Barcelona, as well as the rest of Spain, is the euro (€). Spain adopted the euro in 2002, replacing its previous currency, the peseta. The euro is used across many European countries, making it the common currency for participating nations in the Eurozone.
12 nations began using the euro
A grand total of 205 countries are participating in London's 2012 Olympics.
85
16 teams
4
None
90
Its 204
10.490
71 nations participated at the 2010 Commonwealth Games.
Poland hosted UEFA Euro only once, in 2012.