Average NFL OU line by season 1989 - 2009 These data were taken from the data at sportsdatabase.com using the SDQL query language.
2009 - 42.9
2008 - 42.5
2007 - 41.8
2006 - 40.7
2005 - 41.0
2004 - 41.9
2003 - 41.0
2002 - 41.6
2001 - 39.9
2000 - 41.4
1999 - 40.0
1998 - 40.8
1997 - 40.8
1996 - 40.4
1995 - 40.6
1994 - 39.2
1993 - 36.9
1992 - 37.5
1991 - 37.8
1990 - 40.0
1989 - 41.1
Perhaps the changes in the rules is the reason for the recent upsurge in average OU line -- or is it merely the style of play? Al Gore might call it a result of global warming.
Finally, I agree that the median would be a more relevant stat, but not different enough to motivate me to find it. My guess is that the median would be slightly lower than the average.
Prof Meyer