No way to know. Data not gathered or published yet.
I'm not sure of the percent but I can tell you this. Lots of people are killed. If you are a member of answers.com then you can look over the section in my profile titled World Problems to learn...
I don't know if there is a specific number, but I would say a whole lot. That's why they are trying to stop it. See link below for a full answer.
42
over two million