These are the number of QB's who signed w a Power 5 team and didn't finish their career w that team.

2013: 59 of 72 didn't finish with team they signed with
2014: 46 of 73
2015: 40 of 69 (some still have eligibility)
2016: 28 of 71 (incomplete)
2017: 16 of 74 (incomplete)

— Tom VanHaaren (@TomVH) January 16, 2019