I'm not being coy. I'm actually laying things out. Those are Brady's fumble numbers. Answering you right now means you have to find your own numbers to verify, but here you go:
First 3 years - learning the game and the position, getting some of his highest sack totals
Next 2 years - Brady's fumble numbers drop significantly, and the sack numbers drop
2006 - Significant talent decline on the offense putting Brady in more dangerous positions
2007 - Huge talent upgrade, combined with the full implementation of the more shotgun based offense
2013 - Highest sack total since 2001
You've got a team that went from a mostly power run game, to one that is much more balanced, while pulling the QB away from center, which gives the QB a better chance to see the rush. 2011 is the year we have an outlier where high sack totals didn't lead to significantly more fumbles, and 2006 is the outlier where lower sack totals still saw high fumble numbers.