Here is what the first twenty list of the most popular serials of the last season looks like - if you consider this factor as the average size of the audience of each episode:
The Big Bang Theory (18.4 million)
Roseanne / Roseanne (17.6 million viewers)
These are we / this is us (17.4 million viewers)
Sea Police: Specotmer / NCIS (16.7 million)
Sheldon's Childhood / YOUNG Sheldon (16.0 million)
Good Doctor / The Good Doctor (15.6 million)
Mr. Bull / Bull (14.5 million)
Blue Blood / Blue Bloods (12.9 million)
Sea Police: New Orleans / NCIS: New Orleans (12.3 million)
Anatomy of Passion / Grey's Anatomy (10.9 million)
Hawaii 5-0 / Hawaii Five-0 (10.8 million)
Momash / MOM (10.79 million)
9-1-1 (10.74 million)
Sea Police: Los Angeles / NCIS: LA (10.5 million)
Chicago / Chicago PD (10.4 million)
Doctors Chicago / Chicago Med (10.2 million)
Special Forces / Seal Team (10 million)
Chicago on fire / Chicago Fire (9.9 million)
Think as a criminal / Criminal Minds (9.58 million)
Instinct / Instinct (9.44 million)
According to this list, it can be seen that the mass spectator, basically prefers the so-called procedures - police / criminal dramas, and also - Medical dramas: only a few of the first twenty TV shows are removed in the comedy genre.