soc.history.war.world-war-ii

I'm currently studying history - more specifically Germany from
1918-39. We are currently looking at hitler's rise to power, and I was
wondering if there were any turnout percentages from the 1932
elections in Germany, as we are told that 37% of Germans voted Nazi,
but that does not reflect turnout figures.

I've also been told that my great grandfather never voted for any
political parties to avoid allegiance to them, was this a common
occurrance?

thanks.