So, I'll have to agree with Robert Altman for once, and say that it was garbage. Rather, it turned in to garbage.
The website "jump the shark" says Mash jumped when.......
I believe the numbers are the votes from members visiting the site so you are correct but it is close.
Never Jumped 299
Alan Alda's Moralizing 179
Death (Henry Blake) 176
Charles replaces Frank 164
BJ replaces Trapper 154
Radar goes home 106
Hair Care (BJ grows a mustache) 95
Klinger stops dressing like a woman 83