The FMCSA statistics were compiled Nov 2010 by Carrier411.com:

Carriers with deficient Driver Safety (DRSEA) scores:

17,880

Carriers with deficient Vehicle Safety (VHSEA) scores: 19,054
Carriers with deficient Safety Management (SMSEA) scores: 6,421
Carriers with unsatisfactory carrier safety ratings: 1,717
Carriers with conditional carrier safety ratings: 14,614
Carriers with satisfactory carrier safety ratings: 64,222