It seemed to me that this year we had the worst non-conference schedule I could remember. So just for the heck of it I looked at KenPom ratings and non-conference strength of schedule since 2002:
Year / NCSOS / Final Overall Ranking
2018 302 98
2017 158 66
2016 176 125
2015 287 61
2014 278 53
2013 185 39
2012 219 76
2011 68 18
2010 103 57
2009 239 25
2008 70 51
2007 156 36
2006 268 9
2005 157 2
2004 89 13
2003 257 5
2002 32 8
Year / NCSOS / Final Overall Ranking
2018 302 98
2017 158 66
2016 176 125
2015 287 61
2014 278 53
2013 185 39
2012 219 76
2011 68 18
2010 103 57
2009 239 25
2008 70 51
2007 156 36
2006 268 9
2005 157 2
2004 89 13
2003 257 5
2002 32 8