That's cause there was an instance of mental illness in the 60's, everyone was too high in the 70's to see straight let alone care, look at the administration in the 80's (Ronnie Ray-gun), in the 90's cognitive disorders were the buzz-words. Now it's just stupid....There was one in the 60's, zero in the 70's, couple in the 80's, a little more regular in the 90's, and it looks like it happens every year now.
[/thinly veiled sarcasm]