...being peer reviewed (account for 1/5 of the total score) may have influenced a recent decline, not necessarily academics.
Also, their acceptance rate (exclusivity) has increased slightly recently which also plays into the overall score
BYU has historically been in the 60s and low 70's until just recently
2022 = #89
2021 = #79
2020 = #77
2019 = #77
2018 = #63
2017 = #61
2016 = #68
2015 = #66
2014 = #62
2013 = #62
2012 = #68
2011 = #71
2010 = #75
2009 = #71