Oklahoma: Preliminary 2019 #ACA rates: 1.9% *drop*, but likely would've been ~14% drop w/out #ACASabotage
Oklahoma is pretty clear cut: BCBSOK holds nearly all of the ACA-compliant market share, with CommunityCare HMO having a small number of off-exchange enrollees (the numbers are estimates based on last year's figures).
The Urban Institute projected an 18.4% rate increase due to #MandateRepeal and #ShortAssPlans. BCBSOK doesn't go into specifics about the impact, but does list both of these as significant factors. Knocking 1/3 off this projection gives around 12.4%.
Unsubsidized Oklahoma enrollees are paying an average of $694/month in 2018. Without ACA sabotage, they'd likely see this drop to around $595; instead, they're likely looking at paying roughly $681/month, or an additional $1,033 apiece.