1978-79 Top 30 Ratings -- ABC Enjoys a Hattrick in 1st Place

Written Asking Where The Jiggle in TV Went by Bridger Cunningham

Ratings Data prior to 1984 is scarce, to TV Ratings Guide will post what is available and may update overall network ranks and sitcom scorecards when available.

ABC in 1st Place!?  America was still in disbelief and was in love with the 3rd network.  Still riding on the success of Laverne and Shirley, whom ABC owes its 1st Place prize to, anchored a sitcom-heavy top 30 chart.  Three's Company burgeoned strong due to then-suggestive content, and this season experienced success with fall pilots Mork & Mindy and Taxi entering the ranks.  Given several spring entries in the 70's succeeded, ABC launched Three's spinoff The Ropers and new pilot Angie.  Both burned off within a season.  Less successful were aging Barney Miller, sophomore sensation Soap and What's Happening, which ended after 3 seasons.  Dramas continued strong with Eight is Enough and Charlie's Angels, and the dominated the top 30 with 17 entries.

CBS took a 3rd season in 2nd, with flagship All in the Family fading and ending.  M*A*S*H stayed strong, and the other sitcoms did, okay.  NBC registered a scant 4 entries in the top 30 as it iced its 4th season in 3rd Place in one of the worst decades to grace the network, only topped by the last half of the 2000's.

Source -- http://fbibler.chez.com/tvstats/by_5_yr_period/top_programs_1975-1980.html