NASD,Total,100.00%,68.18%,19.18%,12.63%
NASD,Principal,99.57%,99.85%,98.93%,99.07%
NYSE,Total,100.00%,70.94%,15.85%,13.21%
NYSE,Principal,98.99%,98.91%,99.23%,99.14%
AMEX,Total,100.00%,73.67%,11.13%,15.20%
AMEX,Principal,98.40%,99.56%,92.22%,97.31%