I thought it had been last year also but thought it was still above 100,000, build it and they will come.
But googling their attendance I found this surprising list from an article saying the SEC led the nation in attendance last year with an average of about 78,500, BIG 2nd at 66,100.
Here is the list form that article from 2015, actually a little hard for me to believe they had that many:
Michigan was the top college football draw, leading the country with 110,168 fans per home game in 2015. 
Ohio State (107,244), 
Texas A&M (103,622), 
LSU (102,004), 
Alabama (101,112), 
Tennessee (100,584), Penn State (99,799), 
Georgia (92,746), 
Florida (90,065) and 
Texas (90,035) round out the top ten. 
Looks like UK and Vandy are dragging the SEC attendance down a great deal, and what some fail to realize (IMO) is that lots of seats available leads to higher attendance even with bad teams, and if Bama has 20,000 empty seats they still have 20,000 more fans there than UK when we have a sellout-----and I predict several for UK this year, we averaged over 67,000 our last "decent" team in 07------still didn't break even in the SEC.