To be fair, it's probably best to just show the entire history if you want to go back farther than the last 5 years. The 5-35 stat takes a drastic turn towards the Aggies favor if you look past 1974. I was curious what the record was and looked up the stats on Wiki.
Total:
BYU & USU: BYU leads 48-36
BYU & Utah: Utah leads 60-34
Last 5 years:
BYU & USU: BYU leads 3-2
BYU & Utah: Utah leads 5-0