For those who doubt the officiating being part of the decline:
https://deadspin.com/take-away-the-refs-mics-1820074611
Quote:
You can go back and look at the average penalties per team per game over the past nine years and see it:
2017 6.86
2016 6.64
2015 6.87
2014 6.60
2013 6.08
2012 6.22
2011 6.32
2010 6.02
2009 5.93
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