True, this is in no way a complete picture of all catamaran sailing in FLA. There are fleets that do events other than the Harken series, and there is also local fleet racing in many parts of the state.
However, traditionally the six Harken Series regattas have been the biggest and most commonly attended (thats one of the reason why they were chosen), and I would argue that the stats related to them give a pretty good overall picture of whats going on.
There are some external circumstances that effected the numbers. I was told by a couple A-Cat sailors last weekend that they had a number of conflicts this year with Harken series regattas, so their participation was lower. Another example is the Eustis regatta that had a lower turnout this year since the F18 NAs were the same weekend.
So again, this is just a general overview.