Read it carefully. Each gun icon represents 31,672 incidents.
There are 80.5 gun icons representing 80.5 x 31,672 self defense incidents and 1 gun icon representing other gun incidents. That's 2,549,596 self defense incidents vs 31,672 "other" incidents. If 200,000 women used guns to defend against sexual abuse/assault, it's a legit number. :D
Yes, you can trust me on that math -- I'm asian. <laughs>