That seems like a lame batch of stats.
The first interpretation to hit me would be maybe that Fox Viewers are more gullible in actually trusting their source.
But upon closer inspection, it simply appears that Fox is the only "conservative" news outlet shown. The others ar either liberal-leaning or just generic corporate-biased stuff.
Since the others are all similar it would make sense that their trusters would be spread around the various similar media rather than concentrated in any one.
Obviously Fox being a niche audience catch is going to get ALL of the viewers of that sort.
But added together... the "liberal media" are more trusted.
Nice try.