What is every AFC West Division team's record against the over/under line as an underdog since the 2012 season?

Definitions
Team Over Record Over % Under % Total +/-
Kansas City 30-24-2 55.6% 44.4% +2.3
Las Vegas 65-65-2 50.0% 50.0% +0.6
LA Chargers 43-48-0 47.3% 52.8% -0.3
Denver 33-48-0 40.7% 59.3% -1.1