As if last month’s viewing figures weren’t bad enough for Piers Morgan, official quarterly ratings released yesterday show that CNN has hit a staggering 21-year low. Piers’ prime time chat show has bombed disastrously over the last year, falling 33% in the 24-54 age bracket and 45% overall. US comedians have already started sticking the boot in, with one tweeting:

Piers Morgan has worse Ratings Problems than a Moody's analyst with an undiagnosed brain tumor.

— Dennis Miller (@DennisDMZ) June 26, 2012

How much more can his CNN bosses put up with?