Evo 2017 Reg Numbers - SFV 2622, Smash4 1515, Melee 1435, T7 1278, Injustice2 883, GG 827, UMVC3 648, BB 499, KOF 375 #Evo2017
https://twitter.com/MrWiz/status/881047201694179329
To compare that to 2016.
Evo 2016 Numbers - SFV 5107, Smash 4 - 2662, Melee - 2372, Pokken - 1180, GGxrd - 910, UMvC3 - 782, MKXL - 713, T7FR - 549, KI - 546
https://twitter.com/MrWiz/status/751082933276909569
http://www.neogaf.com/forum/showthread.php?t=1241500&highlight=evo+2016
Percent difference from 2016 to 2017 for returning games (Used an online calculator, rounded to hundredths place. )
SFV: -64.3% difference
Smash 4: -54.92% difference
Melee: -49.22% difference
Tekken 7: +79.80% difference
Guilty Gear: -9.56% difference
UMvC3: -18.74% difference
Edit: More comparison charts:
https://twitter.com/SRKRanking/status/881052238726254593
https://twitter.com/PracticalTAS/status/881050370067369984