For whatever reason, baseballs flew out of the ballpark at a near record pace this past season. An average of 1.155 homers per game were hit in 2016, up from 1.010 last year and 0.861 just two years ago. In fact, 2016 was the second most homer happy season on record. Only in 2000 were more homers hit per game (1.171). My guess is the ball is juiced, but who knows.
Anyway, the Yankees certainly benefited from the home run spike as a team. They hit 183 home runs in 2016, which is down from last year (212), but way up from both 2014 (147) and 2013 (144).