ratings were starting to tank the last season he was there, and as soon as he left the ratings skyrocketed.
I'm not sure where you're getting your information, but as near as I can tell the ratings went from something like 8-9 million per episode in Season 7 (which is about on par with the previous few seasons) and dropped to around 5-6 million after Steve Carrell left.
Me thinks you're talking out of thine ass.
no ---
depressed again morning comes too fast and i'm tired of the routine