First of all, please cite the sources for your statistics. 
Whether or not 'rape' is "the worst subset" is not your call--it's the victim's.
Cite the foundation for your assumption that the percentage of sexual assault that qualifies, in your mind, as "rape".
How did you get to 97.8% of people? Who are these people you're counting? What are you claiming they're doing? 
Rape culture--sorry to insult and offend you--may not exist in your world (I'm assuming you're living all alone on an island somewhere), but buds, I'm 69, and it's been present in my entire world, at differing levels and frequencies, for my entire life-span. Maybe you should be talking with more people. Especially--but not only--with women.