Yes, I would like to know what the percentage of contraceptive-users is for faithful Catholics, but I suppose that is hard to sort out. As Patrick Coffin says on Catholic Answers Live: You should judge the effectiveness of a prescription by the effects on those who actually take the medicine, not those who refuse to follow the prescription. This message may be obscured in this case, since we are referring to those who don’t take the medicine as following the Church, but you get the picture!
If Catholics are using any kind of contraception — they are not REAL Catholics, but CINOs.
They need to go to Confession and learn about Natural Family Planning after that.