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I just came acroos the following link. Some of you might have already checked it out. Go through pages 75-79. It gives the trend of NBDE and correlation between raw score and the curve, during the years 1997 to 2004 (all July PBT exams). Interestingly a raw score of mid to high forties is enough to pass the subjects of NBDE I, except DA!!
http://www.ada.org/prof/ed/testing/natboard/technical_nbde_04_report.pdf
http://www.ada.org/prof/ed/testing/natboard/technical_nbde_04_report.pdf