how many teams go to champions league from each country
Introduced in 1992, the competition replaced the European Champion Clubs' Cup, or simply European Cup, which had run since 1955, adding a group stage to the competition and allowing multiple entrants from certain countries. The pre-1992 competition was initially a straight knockout tournament open only to the champion club of each country. During the 1990s, the format was expanded, incorporating a round-robin group stage to include clubs that finished runner-up of some nations' top-level league. While most of Europe's national leagues can still only enter their national league champion, Europe's strongest national leagues now provide up to five teams for the competition. Clubs that finish next-in-line in each nation's top level league, having not qualified for the UEFA Champions League competition, are eligible for the next-level UEFA Europa League competition.