For their 71st annual Thanksgiving Day game, the Lions hosted the New England Patriots. In a rare occurrence, both teams wore the home versions of their throwback uniforms. The Patriots got on the board first with a 19-yard field goal by Shayne Graham. The Lions took the lead late in the first quarter with a 19-yard TD catch by Calvin Johnson. The Lions added to their lead in the 2nd quarter with a 1-yard run by Maurice Morris. The Patriots responded later in the quarter with a 15-yard run Benjarvus Green-Ellis. The Lions answered just before halftime with a 44-yard field goal. The Patriots tied the game early in the 3rd quarter with a 5-yard catch by Wes Welker. The Lions responded a few minutes later with a 1-yard run by Maurice Morris. The Patriots then scored 4 unanswered touchdowns: a 79-yard catch by Deion Branch, then in the 4th quarter a 22-yard catch by the same, then a 16-yard catch by Wes Welker, and finally a 1-yard run by Benjarvus Green-Ellis. With the loss, the Lions fell to 2-9 and were eliminated from playoff contention.
Question: How many Thanksgiving Day games had these two teams played?
Answer: 71