Every few years? Katrina was 15 years ago, and has been a relatively lull in hurricanes since then.
I’m not sure what relation you’re referring to in “relatively.”
(I grew up in Houston. I'm skeptical of those with short memories, new to the concern, who impressionistically consider every report of a hurricane as "so much bigger & more frequent than before", without actual analysis. But I'd want to see numbers, and a theory of causality, for any claim that they're "down dramatically".)