Honest? 30 percent get reported is a low number. We're talking about sexual assault on women. 100 percent is the correct number to report, and try. Let the accuser and the accused take the stand and let the jury decide. Even if the man goes free, the system will have given the woman to state her case and attempt conviction.
And no, the number of convictions is far, far lower. In Austin, Texas in one year it was one, not one percent, just one case brought to trial according to a deep investigative report The Provability Gap. I'm not sure what your parameters for "real justice" are, but this ain't it. It's no where fair and equal, and in fact the American system looks downright maliciously like it is against women and believing them.