Wyoming: Preliminary avg. 2021 #ACA rates: 10.0% *decrease*
Not much to this one: Wyoming has just a single carrier selling ACA-compliant individual market policies to their 577,000 residents, Blue Cross Blue Shield...which, after raising rates 1.6% for 2020 is now reducing them by a solid 10% on average for 2021. The ~25,000 enrollment figure is an estimate.
For the small group market there are two carriers: BCBSWY and UnitedHealthcare, asking for an unweighted average rate reduction of 0.2% (I don't have a clue how many enrollees either one has).