user: Question: What was the attendance at the game where the opponent was the Denver Broncos?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 7, 1980', 'Denver Broncos', 'W 27–6', 70307.0]
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Opponent" = 'Denver Broncos';