From 2011-12 to 2014-15, the Philadelphia Flyers scored on 20.8 percent of their power plays, which ranked third in the NHL behind the Washington Capitals (22.7) and Pittsburgh Penguins (21.2). Since then, they've scored on 19.2 percent, which ranks 17th in the NHL.
On the surface, it may appear that the Flyers power play is on the decline. But in terms of shot-based metrics, they were sixth in the League in 2015-16 with an average of 102.94 shot attempts per 60 minutes on the man-advantage, and they led the NHL last season with 109.88 shot attempts per 60, according to Natural Stat Trick.
Flyers center Claude Giroux was fourth in the League with 31 power-play points (five goals, 26 assists) in 2016-17, the sixth straight season he finished in the top seven in power-play scoring. During that span, Giroux leads the NHL with 191 power-play points (44 goals, 147 assists) in 448 games.