8%. A telling demonstration of the major misinformation indoctrination that goes on within the JW faith, which is no doubt abetted by their lack of higher education. Almost a fifth of their members never graduated from high school, the poorest showing of all the listed denominations.
Then there's this:
"JWs maintain that the Bible is consistent with modern science, except the entire field of evolutionary biology and parts of geology and archaeology, which are wrong because of the influence of Satan, pagan philosophy and depraved Christian clergy."
source
One has to wonder why Satan picked on the entire field of evolutionary biology and parts of geology and archaeology to mislead those living in the last few 160 years, particularly when one considers its poor showing---only 33% of adults believe humans existed in their present form from the beginning.* One would think he would have picked a more profitable enterprise with which to mislead humans. Of course Satan, pagan philosophy, and a depraved Christian clergy have nothing to do with the dissemination of evolution, the basis of the JW ire, but the simple fact that JWs can't sell their literal reading of the Bible without using them to demonize its enemy, evolution. Evolutionary biology and those fields of science that support it aren't just wrong, but carry the heinous marks of the devil, paganism, and depravity. "Therefore dear JW member, don't even go near evolutionary writings lest ye be pulled away from your Lord and Savior Jesus Christ and fall into lie filled pit of deception."
So, other than the 8% who know better, JWs come away with all the distorted talking points against evolution, but without the ability to back them up. Not that this comes as any surprise, but wouldn't it be nice if someone from the 8% came on board and stood up to the other 92%. However, I'm afraid it won't happen. The JWs are well known for their intolerance of competing ideas being circulated among members.
*source
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Such inflammatory bile.
http://www.historynet.com/what-we-owe-jehovahs-witnesses.htm