Of NFL teams who have gone to the Super Bowl, how many have a win percentage of Super Bowls of at least 50%? 
 Boston/New England Patriots, Pittsburgh Steelers, Dallas Cowboys, San Francisco 49ers, New York Giants, Green Bay Packers, Kansas City Chiefs, Washington Redskins/Football Team/Commanders, Oakland/Los Angeles/Las Vegas Raiders, Baltimore/Indianapolis Colts, Tampa Bay Buccaneers, Baltimore Ravens, Chicago Bears, New Orleans Saints, New York Jets