My guess is about 25%
Are you shocked???
I'll tell you why I say this.
Very, very, very few JW's have computer expertise. They work at feckless jobs and are kept busy, busy, busy. They've been warned off the Internet for years. Older people (over 30) never learned how to use a computer and don't trust them.
Do you know how many people my age even know how to turn on a computer???
The persons most likely to view a "dangerous Apostate website" in the Kingdom Hall crowd are teens using their illicit friend's PC. That is not very many.
Most of the knuckle-draggers who come here to lurk and talk smack are teens and young adults without a clue as to what their religion is all about. They feel invincible and want to take down the stupid Apostates with their mighty sword of Truth.
Once they are disabused; they leave.
It is only the YOUNGER GENERATION in religions worldwide that you find a narrow group willing to open themselves up to being proved wrong by anybody.
Youth is very ego-driven.