I got y'all. Considered increasing number of games, start of CCGs, FBS team additions, increasing number of bowl games, but I didn't see much correlation.
Wiki conference standings, counted them up and divided by 2
Ties: (0.5 games means likely at least 1 FBS vs. FCS tie)
1982 - 14.5 FBS games (FBS/FCS split, 105 FBS teams, 16 Bowls)
1983 - 13.5 tie games
1984 - 16 tie games (18 Bowls)
1985 - 15 tie games
1986 - 9 tie games
1987 - 13.5 tie games (104 FBS teams)
1988 - 11.5 tie games (17 Bowl games)
1989 - 14.5 tie games (106 FBS teams, 18 bowls)
1990 - 15.5 tie games (19 bowls)
1991 - 15 tie games (18 bowls)
1992 - 12.5 tie games (107 FBS teams, start of CCGs)
1993 - 11 tie games (106 FBS teams, 19 bowls)
1994 - 13 tie games (107 FBS teams)
1995 - 9 tie games + 1 OT game (108 FBS teams, 18 bowls)
https://www.reddit.com/r/CFB/comments/4j..._football/
OTs:
1996 – 26 OT games (111 FBS teams)
1997 – 25 OT games (112 FBS teams, 20 bowls)
1998 – 25 OT games (BCS era, 22 bowls)
1999 – 29 OT games (114 FBS teams, 23 bowls)
2000 – 36 OT games (116 FBS teams, 25 bowls)
2001 – 17 OT games (117 FBS teams)
2002 – 31 OT games (28 bowls)
2003 – 34 OT games
2004 – 32 OT games
2005 – 39 OT games (119 FBS teams)
2006 – 34 OT games (12 game seasons, 32 bowls)
2007 – 34 OT games
2008 – 32 OT games (34 bowls)
2009 – 29 OT games (120 FBS teams)
2010 – 29 OT games (35 bowls)
2011 – 34 OT games
2012 – 45 OT games
2013 – 35 OT games (124 FBS teams)
2014 – 35 OT games (start of NY6/CFP, 126 FBS teams, 39 bowls)
2015 – 34 OT games (127 FBS teams, 41 bowls)