Seasons | Teams |

All 20 | |

All 20 | |

All 20 | |

All 20 | |

All 20 | |

All 20 | |

All 20 | |

Only 18 out of the 20 years | |

Only 18 out of the 20 years | |

Only 16 out of the 20 years | |

Only 15 out of the 20 years | |

Only 14 out of the 20 years | |

Only 13 out of the 20 years | |

Only 13 out of the 20 years | |

Only 12 out of the 20 years | |

Only 11 out of the 20 years | |

Only 11 out of the 20 years | |

Only 9 out of the 20 years | |

Only 8 out of the 20 years | |

Only 8 out of the 20 years | |

Only 8 out of the 20 years | |

Only 8 out of the 20 years | |

Only 7 out of the 20 years | |

Only 7 out of the 20 years | |

Only 7 out of the 20 years | |

Only 7 out of the 20 years | |

Only 6 out of the 20 years | |

Only 5 out of the 20 years | |

Only 5 out of the 20 years | |

Only 5 out of the 20 years | |

Only 4 out of the 20 years | |

Only 4 out of the 20 years | |

Only 4 out of the 20 years | |

Only 4 out of the 20 years | |

Only 3 out of the 20 years | |

Only 2 out of the 20 years | |

Only 2 out of the 20 years | |

Only 2 out of the 20 years | |

Only 2 out of the 20 years | |

Only 2 out of the 20 years | |

Only 1 out of the 20 years | |

Only 1 out of the 20 years | |

Only 1 out of the 20 years | |

Only 1 out of the 20 years | |

Only 1 out of the 20 years | |

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