2011 - Utah 49 - BYU 90
2012 - Utah 41 - BYU 63
2013 - Utah 3 - BYU 38
2014 - Utah 36 - BYU 69
2015 - Utah 29 - BYU 65
2016 - Utah 60 - BYU 75
If you want to know what it is for each unique opponent, here's the website.
https://www.usatoday.com/sports/ncaaf/sagarin/
I'm not up to looking up SOS for 90 games played over a period 6 years.