Current choices (first run of teams + those listed above):
1971 - Nebraska
1976 - Pitt
1977 - ND, Arkansas, Kentucky
1979 - Purdue, Temple
1980 - UGA, Pitt
1981 - Clemson
1982 - Penn St, SMU
1983 - Miami, Nebraska, Auburn
1984 - Washington, Florida, BC, BYU
1985 - Michigan, Iowa, OU
1986 - Penn St, ASU, Miami
1987 - Miami, Syracuse, FSU
1988 - ND, Indiana, OK State, WVU
1989 - Miami, Houston, Illinois
1990 - Colorado, GA Tech, Virginia
1991 - Miami, Washington
1992 - Alabama, ND
1993 - FSU, Auburn, Wisconsin
1994 - Nebaska, Penn St
1995 - Nebraska, Florida, Northwestern
1996 - Florida, Ohio St, ASU
1997 - Nebraska, Michigan, Tennessee, UCLA, UNC, Wash.St
1998 - Tennessee, Ohio St, Arizona, Kansas St
1999 - VA Tech, FSU, Nebraska
2000 - OU, Miami, Oregon St, Iowa St
2001 - Maryland, Miami, Florida, Oregon
2002 - Ohio St, NC State, Iowa, USC, UGA
2003 - LSU, Ole Miss, OU, Minnesota
2004 - USC, Auburn, Cal, Utah
2005 - Texas
2006 - Florida, Ohio St, Rutgers, Louisville, Wake Forest
2007 - LSU, Missouri, WVU, Kansas
2008 - Florida, Texas Tech
2009 - Alabama
2010 - Auburn, Stanford, Oregon, TCU
2011 - Alabama, OK State, Baylor
2012 - Alabama, Texas A&M, Vanderbilt
2013 - FSU, Michigan St, South Carolina, Duke
2014 - Ohio St, Miss St
2015 - Alabama
2016 - Clemson
2017 - Alabama
Obviously, I'll add a team or two to 2005 and 2009. The mythical nature of the national championship back in the day lends itself to creating more top teams. The playoff sort of snips that off to some degree. But I'll still add on a Mariota Oregon team. The blowouts in 2015 make them kind of 'meh', but the 2017 OU and UGA teams were worthwhile, for sure.
If I'm missing a P5 school above, please let me know. I did my best to create at least everyone's best season from the last 30 years or so. I could fill in the 70s at some point, but this is a lot of data entry, printing, and cutting, lol.