There has also been a huge decline in the trust of the mass media, especially among Republicans – from a high of 52% in 1998 down to a mere 14% in 2016. Independents’ trust in the mass media peaked at 55% in 1999 and has fallen to 30%. Democrats’ trust fell from 70% in 2005 to 51% currently。

2014数据：

http://www.gallup.com/poll/176042/trust-mass-media-returns-time-low.aspx

http://www.washingtontimes.com/news/2016/sep/14/gallup-poll-american-trust-in-news-media-falls-to-/