After one of the worst games of his career on Sunday night, Green Bay Packers quarterback Aaron Rodgers was quick to point out that this season is only two games old. "Well, it's Week 2. There's always a lot of work to be done," he said.

The problem with that statement is that Green Bay had an entire offseason to fix last year's broken offense, which finished 21st in weighted DVOA. Though star wideout Jordy Nelson has returned, the offense looks awfully similar to the unit that struggled through the final dozen games in 2015. The Packers rank 25th in offensive DVOA, and 26th in passing offense this season. (DVOA is Football Outsiders' proprietary Defense-adjusted Value Over Average metric, explained here.)

Clearly, this is about more than just one bad night in Minnesota against a tough defense. This has been a 14-game slump for one of the best quarterbacks in NFL history during what should still be his prime. What can history teach us about when the slump might end? How likely is it Rodgers can return to his past glory?