You may also want to look at days-to-cover which really did not move much.
From nasdaq website:
1/15/2013 5,460,759 1,870,777 2.918979 12/31/2012 3,546,151 1,548,920 2.289435 12/14/2012 2,593,511 1,146,748 2.261622 11/30/2012 3,128,270 831,946 3.760184 11/15/2012 2,875,901 1,580,853 1.819208 10/31/2012 3,549,502 838,631 4.232496 10/15/2012 3,467,592 1,312,120 2.642740 9/28/2012 3,348,611 721,171 4.643297 9/14/2012 3,306,308 674,535 4.901611 8/31/2012 3,340,217 614,434 5.436250 8/15/2012 3,389,650 787,740 4.303006