Growth of High Frequency Quote Spam in the Stock Market

2 millisecond peak message traffic for every 10 minute period between market open (9:30) and close (16:00) in Tapes A and B (CQS) for each trading day from September 2009 through September 13, 2013. CQS, the consolidated quote data feed carries quotes for NYSE, NYSE-Mkt, and NYSE-Arca listed securities.
The vertical scale is in quotes per second which was at 1000/second in 1999, and is now approaching 2 million/second. The gaping is when network capacity was increased.