71.4% is an awful lot... ain't it??? I just looked at that link through all the history they have back to 1999, and this is the largest ever for 1 week!
Second largest was 70.5% in 2004 (June 21-24)... besides that the next highest was 59.6% which happened twice... It's strange looking back to 1999 and seeing that program trading progressively grows larger and larger month after month, year after year. Looks like the market is literally being "programmed" for another CRASH!