This is from a 2010 article.
I also found this graphic on Redit
Most years appear to be just under 60% return with the eyeball, but if you do the math I believe it works out closer to 50%
We have Cj S2roud, that should help. Hopefully we don't lose Bobby Slowick, I think that will be a heck of a hurdle to overcome, but if anyone can do it, it's S2roud. Then we'll probably add a high-dollar FA or two & that could affect the locker room chemistry. Who knows. They have their work cut out for them, hopefully the dysfunction doesn't return. Right?
According to Mike Florio of NBC Sports’ ProFootballTalk.com, half is the norm . But after looking back over the last decade or so, I found that half is actually higher than average.
Since the 2001 NFL playoffs (those that took place after the 2000 regular season), an average of 5.6 teams per postseason were in the playoffs the year prior. That amounts to a 46.9 percent turnover.
Three times—2001-2002, 2007-2008, 2009-2010—the turnover of playoff teams from one year to the next was six (50 percent). Three times—2005-2006, 2006-2007, 2008-2009—the turnover was five (41.7 percent). Once—2003-2004—the turnover of playoff teams was four (33 percent).
Twice since the 2001 NFL playoffs there have been turnovers over 50 percent. Seven teams repeated playoff appearances from 2002 to 2003 and from 2004 to 2005 (58.3 percent).
Pro football has also had plenty of one-year wonders—playoff teams that did not qualify the year before and do not the year after.
During the last nine NFL postseasons, there have been 27 one-year wonders out of a possible 84—32.1 percent. (There are only 84 possible teams because no playoffs exist after 2010 and none are being measured before 2002. Therefore, 2003-2009 are the only years of the study with possible one-year wonders.)
I also found this graphic on Redit

Most years appear to be just under 60% return with the eyeball, but if you do the math I believe it works out closer to 50%
We have Cj S2roud, that should help. Hopefully we don't lose Bobby Slowick, I think that will be a heck of a hurdle to overcome, but if anyone can do it, it's S2roud. Then we'll probably add a high-dollar FA or two & that could affect the locker room chemistry. Who knows. They have their work cut out for them, hopefully the dysfunction doesn't return. Right?