1970-71 CBS has nine shows top 20, thirteen in top 30
1. Marcus Welby, M.D. ABC 17,789,600
2. The Flip Wilson Show NBC 16,767,900
3. Here's Lucy CBS 15,686,100
4. Ironside NBC 15,445,700
5. Gunsmoke CBS 15,325,500
6.ABC Movie of the Week ABC 15,085,100
7.Hawaii Five-O CBS 15,025,000
8.Medical Center CBS 14,724,500
9.Bonanza NBC 14,363,900
10.The F.B.I. ABC 13,823,000
11.Mod Squad ABC 13,642,700
12.Adam 12 NBC 13,582,600
13. Rowan & Martin's Laugh-In NBC 13,462,400
14. The Wonderful World of Disney NBC 13,462,400
15. Mayberry R.F.D. CBS 13,402,300
16. Hee Haw CBS 12,861,400
17. Mannix CBS 12,801,300
18. The Men from Shiloh NBC 12,741,200
19. My Three Sons CBS 12,500,800
20.The Doris Day Show CBS 12,440,700
1971-72 Eight Shows top 20, fourteen in top 30
1. All in the Family CBS 21,114,000
2. The Flip Wilson Show NBC 17,512,200
3. Marcus Welby, M.D. ABC 17,263,800
4. Gunsmoke CBS 16,146,000
5. ABC Movie of the Week ABC 15,897,600
6.Sanford and Son NBC 15,649,200
7.Mannix CBS 15,400,800
8.Funny Face CBS 14,841,900
9.Adam 12 NBC 14,841,900
10.The Mary Tyler Moore Show CBS 14,717,700
11.Here's Lucy CBS 14,717,700
12.Hawaii Five-O CBS 14,655,600
13. Medical Center CBS 14,593,500
14. The NBC Mystery Movie NBC 14,407,200
15. Ironside NBC 14,283,000
16. The Partridge Family ABC 14,034,600
17. The F.B.I. ABC 13,910,400
18. The New Dick Van Dyke Show CBS 13,786,200
19. The Wonderful World of Disney NBC 13,662,000
20. Bonanza NBC 13,599,900
1972-73 10 shows in top 20, thirteen in top 30
1. All in the Family CBS 21,578,400
2. Sanford and Son NBC 17,884,800
3. Hawaii Five-O CBS 16,329,600
4. Maude CBS 16,005,600
5. Bridget Loves Bernie CBS 15,681,600
6.The NBC Sunday Mystery Movie NBC 15,681,600
7.The Mary Tyler Moore Show CBS 15,292,800
8.Gunsmoke CBS 15,292,800
9.The Wonderful World of Disney NBC 15,228,000
10.Ironside NBC 15,163,200
11.Adam 12 NBC 15,098,400
12.The Flip Wilson Show NBC 14,968,800
13. Marcus Welby, M.D. ABC 14,839,200
14. Cannon CBS 14,515,200
15. Here's Lucy CBS 14,191,200
16. The Bob Newhart Show CBS 14,126,400
17. Tuesday Movie of the Week ABC 13,932,000
18. Monday Night Football ABC 13,608,000
19. The Partridge Family ABC 13,348,800
20. The Waltons CBS 13,348,800
Note, each season roughly two million more households had TV sets