National Sinkhole stats

Any one know where to get them?
I´ve done a small search on google but haven´t had any luck.
I´d like to know if there are more of them than usual. If so it may relate to the exspanding earth theory and possibly relate to all the earthquake activity as well.
I´ve even had one in my area but there is no reporting on it. A thirty foot hole opened up in a new car lot and ate a few cars.