Crap sorry. Didn't realize it was plus. It's super long. I'll summarize.
1920sā
1. USC (92.5 percentile, five top-five SP+ finishes, three No. 1s)
2. Notre Dame (87.2, four top-fives, one No. 1)
3. Alabama (85.8, four top-fives, one No. 1)
1930sā
1. Alabama (96.0 percentile, five top-fives, one No. 1)
2. Tennessee (91.3, six top-fives, two No. 1s)
3. Pitt (90.6, three top-fives)
1940sā
1. Michigan (95.8 percentile, five top-fives, one No. 1)
2. Notre Dame (92.8, five top-fives)
3. Texas (92.3, five top-fives, two No. 1s)
4. Alabama (87.6, one top-five)
5. Penn (87.3, one top-five)
1960sā
1. Alabama (94.4 percentile, six top-fives, three No. 1s)
2. Arkansas (92.7, three top-fives)
3. Texas (92.7, five top-fives)
1. Alabama (98.2 percentile, nine top-fives, two No. 1s)
2. Nebraska (98.0, seven top-fives, three No. 1s)
3. Michigan (97.6, four top-fives)
1980sā
1. Nebraska (97.3 percentile, eight top-fives, four No. 1s)
2. Miami (93.4, four top-fives, four No. 1s)
3. Oklahoma (92.8, three top-fives)
4. Michigan (91.5, two top-fives, one No. 1)
5. Alabama (90.4, one top-five)
2010sā
1. Alabama (98.3, 10 top-fives, eight No. 1s)
2. Ohio State (94.1, eight top-fives, one No. 1)
3. LSU (93.3, five top-fives)
2020sā
Obviously we're only three years into the current decade, so we'll see how things take shape from here. But just for posterity, here's where things stand for now.
1. Alabama (98.9)
2. Ohio State (98.2)
3. Georgia (97.8)