As the not-exactly-Left-wing JPost points out, the highest avoidance comes from: 1) 51% Jerusalem 2) 25% The West Bank The two areas most radical about what the IDF should be doing are the least likely Jews to serve. So, where does your lie about 50% come from? Perhaps you include modern-Orthodox, who tend to be a bit more realistic? Perhaps self-identification on IDF forms? Of course, with you just making claims, nobody really knows...
Ofir Akunis officially replaces Danny Danon as minister of science, technology, and space (Haaretz)
from the article: IDF: Nearly 28% of Israeli males avoided conscription in 2007