Montana was the same. It is from the economy doing so well under Trump (that isn't a political statement). I would hope the reason was from all of the Washington hunters seeing how bad this state sucks for hunting and getting nothing but worse so they jumped ship! haha
With that said, it isn't a slam dunk to go hunt these other western states. Yes, the hunting is better and more animals and less people, but a good hunt needs decent access and it is still a issue that can be hard to get past. Lots of off-season research and PR is needed to have a good hunt.