It’s a complex issue. It would be more accurate if it showed the share of people in each region that feel one way or another.
But to be able to do that, we should count them.
And Spain made very clear in October 2017 that such a count (ie. a referendum) is illegal.
So right now whoever says “the majority of X wants to secede/stay” right now, independently of being right or wrong, is doing so without data to ground that claim.
Well, and that being said, my very personal perception is that the will to leave is more significant (without going into whether it’s majority or not) in Catalonia, Galicia and the Basque Country. The other highlighted in my opinion would be happy with greater recognition of their peculiarities (namely language) and less dependence of a central government.
I’m sacrificing a lot of accuracy and nuance in order to keep my comment short.
