Check referendum on the dates: 9N-2014, 25N-2015, and many others Wikipedia have an extense article about the times they go to vote freely: https://es.wikipedia.org/wiki/Proceso_soberanista_de_Catalu%...
The 9N consultation came out with what, 80% support for independence?
I was responding to the OP's statement:
> We must remember that Catalonia has already held two legal referendums, where the result has been a refusal of the Catalan people to leave Spain or Independence.