Changes in the NHL overtime system have led to more games going to overtime. Link here.
In 2000, the National Hockey League began rewarding teams for ties at the end of regulation by granting a point in the league standings to teams that lose in overtime. That makes overtime games worth one more point than other games, because winners of any game get two points. In the nine seasons since that rule change, the probability of games going to overtime has increased by 21% compared with the nine seasons before the change, according to Justin Kubatko, vice president of Sports Reference LLC, as teams have scrambled to hold on for overtime and the guaranteed point it confers.