Goals are hard to come by in hockey, particularly at even strength, when there isn't much open real estate on the ice. At five-on-five this season, the league average for goals scored per hour of play is 2.5, and just 4.5% of all shot attempts toward the net actually wind up in the back of the net. On the power play, those rates go up to 6.8 goals per hour, and 7.2% of shot attempts that result in goals. That increased likelihood of scoring may not seem like much, but it's actually quite huge given the razor-thin margin between winning and losing.
NHL power plays: Who's doing it right, who needs major help
