Here in NE Kansas we have several kinds, including annual varieties, so we never have a summer without the undulating "eeeeeeeeeeeeeEEEEEEEEEEEeeeeeeEEEEEEEEEEEEEEEEEEeeeeeeeeeeeeeeeeeeeeee"
The big news comes in years where the 3-year, 5-year, 7-year, 13-year and 17-year overlap, which is what happened in '98 (or somesuch nonsense).
I think we have an overlap year next year, but most of the maps don't really indicate we even have the darn things! Those entomologists should take a look at my elm trees and walnuts every year!