http://www.stateofthenewsmedia.org/2005/narrative_networktv_audience.asp?cat=3&media=4
In 1980, the three commercial network nightly news broadcasts had a combined 37% rating, and a 75% share. And at their historic peak, in 1969, they had a 50% rating and an 85% share. The November 2004 figures mean that ratings have fallen almost 59.6 % since 1969, and 45.4% sinc1e 1980. Share has fallen 55.3% since 1969 and 49.3% since 1980.5
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Great stats on news media
http://www.stateofthenewsmedia.org/2005/narrative_networktv_audience.asp?cat=3&media=4