I have some data from 2011, 2015 and 2016 if anyone is interested. Also I know a poll for 2012 exists but I don't have the results. Barely have anything for 2016 because I didn't bother much.
https://docs.google.com/forms/d/e/1FAIpQLScxjKXbsgMU6Kd9HrAxNFgnJGdZXIZ8FAzdrTKtJtPJSsU5Sw/viewform?usp=sf_link