I think it`s the same everywhere these days. At Oslo Stock Exchange in Norway, 40 million orders were submitted at the exchange during last November, but only 1 out of 20 resulted in an actual transaction. Close to 1/3 of the orders were deleted after 16 ms or faster. After 1 second, 56 % of the orders are pulled. It`s funny, because there is another very strange case going on in Norway regarding the same subject. Two human beings, a daytrader and a student is accused of having tricked one of the bots of Timber Hill for their own profit, while the bot lost money. How so? Well, they learned that the bot behaved in a predictable manner and then used market orders that were pulled, in order to manipulate price movement for their own profit.
http://news.yahoo.com/securities-watchdog-probes-high-frequency-trading-firms-report-063227979.html Securities watchdog probes high-frequency trading firms: report
Ive spotted manipulation for YEARS using only my own two eyes. Others have gotten very fancy with microsecond analysis to prove th same thing. Eventually they will be stopped.