 Complete the following phrase:  Owing to CONMEBOLs somewhat limited number of registered national football federations, countries from other continents are usually invited to participate to make up the 12 teams necessary for the current tournament format. Since 1993, two teams from other confederations, usually from CONCACAF whose members are geographically and culturally close, have also been invited. In all, nine nations have received invitations: Costa Rica 1997, 2001, 2004, 