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As I suggest in this previous post, special teams time increases shooting percentage and decreases save percentage roughly equally across the league. So if you want to find another reason for lower scoring (in addition to parity and goaltender padding/ubiquity of butterfly), you could also look at the percentage of time teams are spending on the PP/PK versus even-strength nowadays. 
I’d add, though, that increased special teams time wouldn’t necessarily be the silver bullet for low scoring, as teams convert powerplays far less than they did in the past.
Note: The years on the x-axis show the first year of the season (for instance, “2002” = “2002-03”).

As I suggest in this previous post, special teams time increases shooting percentage and decreases save percentage roughly equally across the league. So if you want to find another reason for lower scoring (in addition to parity and goaltender padding/ubiquity of butterfly), you could also look at the percentage of time teams are spending on the PP/PK versus even-strength nowadays. 

I’d add, though, that increased special teams time wouldn’t necessarily be the silver bullet for low scoring, as teams convert powerplays far less than they did in the past.

Note: The years on the x-axis show the first year of the season (for instance, “2002” = “2002-03”).