how many nfl shutouts in 2020
how many nfl shutouts in 2019
how many nfl shutouts in 2018
how many nfl shutouts in 2017
how many nfl shutouts in 2016
how many nfl shutouts in 2015
how many nfl shutouts in 2014
how many nfl shutouts in 2013
what teams leads in offensive
how many nfl shutouts in 2012
how many nfl shutouts in 2011
how many nfl shutouts in 2010
how many nfl shutouts in 2009
how many nfl shutouts in 2008
how many nfl shutouts in 2007
