structural:summarization
Promotion and relegation

A system of promotion and relegation exists between the Primera División and the Segunda División. The three lowest placed teams in La Liga are relegated to the Segunda División, and the top two teams from the Segunda División promoted to La Liga, with an additional club promoted after a series of play-offs involving the third, fourth, fifth and sixth placed clubs. Below is a complete record of how many teams played in each season throughout the league's history;