NASD,Total,100.00%,60.04%,9.77%,30.19%
NASD,Principal,74.07%,75.86%,74.51%,70.36%
NASD,GSCO,19.10%,20.65%,14.49%,17.50%
NYSE,Total,100.00%,27.68%,4.72%,67.60%
NYSE,Principal,44.09%,79.90%,65.36%,27.94%
NYSE,INET,32.19%,0.00%,0.16%,47.60%
NYSE,GSCO,11.17%,16.68%,23.37%,8.06%
NYSE,Archipelago Trading Services,10.56%,0.06%,11.11%,14.82%
AMEX,Total,100.00%,30.92%,11.13%,57.94%
AMEX,Principal,70.92%,59.04%,76.78%,76.14%
AMEX,GSCO,22.27%,36.52%,5.69%,17.85%