I do not know the type of citizen according to the place but don't you think it's rather correlated to the politic in the states (since it's a federal state)?
If a state is pro-bitcoin, there is a better chance of finding interested citizens. As opposed to an anti-bitcoin state, in which citizens would not be interested.
That would be consistent with seeing a state like California knowing for e.g. they wanted to make bitcoin a payment means to pay taxes, licenses, and other stuff. Look at NYC, Washington...
by the way
The graph makes me think about hip-hop music in The US. The same old battle East coast VS West coast