Come up with a calculation for the risk of being swallowed up by a sinkhole in Florida?

Come up with a calculation for the risk of being swallowed up by a sinkhole in Florida?

Roughly 65% of Florida is well-developed karst - meaning it is even more prone to sinkholes than the rest of the karst landscape in the state.

So, with that information, what other variables do I need in order to put together some kind of equation? And how can I set this up?