Note: Dateline Sunday only airs in the spring; Dateline Friday data for the month of April 2013 are not available and therefore not included in the 2013 average. In 2015, Nielsen provided the Pew Research Center with weighted annual averages for each network starting with 2008 data. Weighted averages better account for slight differences in the number of programming hours in each broadcast month. Viewership corresponds to the average of quarter-hour audience for each network.
Source: Pew Research Center analysis of Nielsen Media Research data, used under license.
“State of the News Media 2016”