Keep in mind that "once in two hundred years" is (an estimate of) the probability of a given event. The more events you track, the more "once in two hundred yea

Keep in mind that "once in two hundred years" is (an estimate of) the probability of a given event. The more events you track, the more "once in two hundred years" events you'll see in any given year. If you're tracking (or reporting on) many events... Think of the number of hundred year floods you see reported on each year. Then look at the number of floodplains that your news source would report on...