Total unscientific observation but where I live (southern California) local airport seems to have less planes parked than maybe a 1-2 decades ago. If I recall

Total unscientific observation but where I live (southern California) local airport seems to have less planes parked than maybe a 1-2 decades ago. If I recall correctly, the parking area of the airport used to be packed with small single engine planes. Now, it's kinda empty.