And with 12% every voter would’ve had to vote at least twice with a portion needing to vote at least thrice for Israel to get first place.
Only if there were an even proportion of ESC-voters across Spain's population, which I see no reason to assume. People with a political motive are more motivated to vote than everyone else who might not have cared for any of the songs and thus not voted at all.
If that's what you want to assume, ok. I think we're past the point of useful discussion here, as neither of us can back up our assumptions.