I did a quick serach and came with with one site that appears to have a "clinical" review of Partial Birth numbers:
"The exact number of D&Xs performed is impossible to estimate with accuracy. Many states do not have strict reporting regulations.
- One often quoted figure was that over 1000 D&Xs had been performed annually in New Jersey. From this number, many inflated national totals were estimated. But the New Jersey figure appears to be an anomaly. A single physician in a single NJ hospital had been ignoring the regulations of the state medical association and performing D&Xs in cases not involving the potential death or serious disability of the woman.
- Ron Fitzsimmons, executive director of the National Coalition of Abortion Providers, estimated (Nightline program, 1997-FEB-26) a total of 3,000 to 4,000 annually in the US -- about ten a day.
- Pro-life groups uncovered an internal memo by Planned Parenthood which estimated that up to 60 (0.24%) of the more than 25,000 abortions performed annually in Virginia were D&Xs. 1 If this figure is accurate nationally, then there would be up to 2,880 D&X procedures per year in the U.S."
http://www.religioustolerance.org/abo_pba1.htm