IDK the actual volumes, but have gotten a few estimates for painting one of my 80's with no body work except a couple
of door dings. The price ranged from $1500 for an extremely cheapo job (painting over door handle and fender flare gaskets) to $11,000+ for factory plus level work, ie: everything removed (door handles, flares, roof rack, dust deflector, windshield, hatch glass, lights, grill), before painting and using high quality supplies (paint, primer, clear coat, UV additives, etc,).
The price of the supplies alone can vary greatly; from a few hundred for the cheapest coatings, to well over $1000 for the good stuff.
HTH.