Kanuti, I didn't even notice that until you pointed it out. Strange. I've looked at a lot of the data which is available for free from Nasdaq and the composition of what is available changes quite a bit year-by-year, but with a general and strong trend toward more and more info being available over time. Thus my WAG is that 1999 is omitted either because the data was not available from all the exhanges or because some gnome at Nasdaq messed up and nobody noticed. My money is on the latter, but that's JMDO.
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