After their win over the Eagles, the Giants stayed at home for a Monday night matchup against the Cincinnati Bengals, who were coming back from London after their tie against the Redskins. Tom Coughlin, Justin Tuck, and Ernie Accorsi were inducted into the Giants Ring of Honor at halftime nursing a 14-10 lead. The Bengals quickly got 10 points and had a 6 point lead going into the 4th quarter. Sterling Shepard caught a touchdown on 4th and Goal to give the Giants a 21-20 lead. Their defense led by their vaunted pass rush took over and the offense successfully ran out the clock. The Giants improved to 6-3, their best start since the 2012 season.

Answer this question based on the article: How many years has it been since the Giants have had such a great start to the season?
6