The latest TV viewing figures, for November 2009, show that Channel 4 recorded a 0.8 percentage point fall on November 2008.
BBC One and BBC Two were also down year on year. However, ITV1 managed to record an increase.
Other channels also posted a rise in November.
All Viewing
BBC Two’s viewing share fell by 1.2 percentage points to 7.1% in November, which was the largest percentage point fall in the category.
BBC One, meanwhile, was down by 0.7 percentage points to 20.9%. Channel 4 posted a similar fall of 0.8 percentage points, which takes it down to 6.2%.
Five remained static in November at 4.8%.
ITV1 bucked the trend with big ratings hits such as The X Factor and reported a 0.7 percentage point increase to 19.7%.
Other channels were up 2.2 percentage points year on year to 40.8%.
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Digital Viewing
It was a more positive picture in digital homes, with BBC One, ITV1 and Five all seeing their viewing shares increase year on year.
BBC One and Five both posted a 0.1 percentage point increase, which takes them to 20.2% and 4.7% respectively.
ITV1, meanwhile, enjoyed a 1.0 percentage point rise to 19.2%.
However, Channel 4 and BBC Two did not do as well. BBC Two was down 0.8 percentage points to 6.6%, while Channel 4 fell by 0.4 percentage points to 5.8%.
Other channels remained relatively static year on year at 43%.
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Data to form this report can be found in the Television database. For any assistance please contact the helpdesk on 020 7439 7575.