No one keeps the stats you are after, but data on hotels is readily available here: http://corporate.visitorlando.com/research-and-statistics/or
Your results in STR will come down to how much effort you personally put into marketing and taking bookings.
Please let me know if I can help you further
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Unfortunetly there isn't a way to do that.
Short term rentals are basically in the hands of the owner, property manager and the company you use. You could Google Florida Vacation Rental Management companies, for an example. Find a few and click on a couple of homes and check their availability calendar.It really does depend on the management.....
There are some really good ones out there....and some really bad.