What's Mallard raving about today?
Fox News, CBS, ABC, NBC.
It's impossible to know exactly what data Mallard is referring to if he's even referring to specific data at all.
That said, the networks have been losing viewers to cable for years, so the fact that Mallard's just now noticing the waning primacy of the networks only shows how out of touch he is. Not to mention the fact that the networks would just as soon stop covering the news if they could, so this is an apples-to-kumquats comparison.
Also, you should feel free to ignore the fact that Fox News is losing viewers to direct competitors MSNBC and CNN. I'm shocked, shocked I tell you, that Mallard did not mention that fact.