wikipedia has people involved in the project. We call them editors. As time goes by the number of these people tends to increase. Now the autofellatio debate took place in 2005 which 2 years ago. Since then the number of editors has increased rather a lot. now if you look at the first section of Talk:Autofellatio/Image polls and discussions you will see that the votes tally to 116. Now there are less than 116 involved in this debate ( this being the Rorschach inkblot image) and the total population of editors is much higher. Thus we can conclude that the percentage this time around is much lower. As I said all this is trivial to calculate.   