Here are the numbers when targeting Gronk in the end zone, year by year for his career:
2010: 6 target, 6 TD
2011: 17 target, 13 TD
2012: 13 target, 7 TD
2013: 4 target, 1 TD
2014: 9 target, 6 TD
2015: 12 target, 4 TD
2016: 4 target, 1 TD
2017: 9 target, 4 TD
2019: 7 target, 0 TD
That puts him at 28% rec percentage since 2015. That's 49th in the NFL over that span among players with 20+ targets in the end zone. Obviously the first few years were amazing and not sustainable, and I'm not sure if its a change in how teams defend him, how the Pats use him, play calling, or something else yet but that's pretty alarming and not a confidence inspiring trending heading into the playoffs.