who has the best defense in nfl football?
['1976 Pittsburgh Steelers.', '2013 Seattle Seahawks. ... ', '2002 Tampa Bay Buccaneers. ... ', '1962 Green Bay Packers. ... ', '1972 Miami Dolphins. ... ', '2008 Pittsburgh Steelers. ... ', '1991 Philadelphia Eagles. ... ', '2015 Denver Broncos. ... ']