From 2013-14, the Yankees hardly qualified as the Bronx Bombers. The Yankees had their worst set of back-to-back offensive seasons since the early-1990s and a shortage of power was a main culprit. The team hit 200+ homers 12 times in 13 years from 2000-12 — including a franchise record 245 homers in 2012 — before falling to 144 homers in 2013 and 147 homers in 2014. The 101-homer drop from 2012-13 is the largest from one year to the next in baseball history.
The lack of power stemmed from a little of everything — injuries, roster construction, age, you name it.