Ace Hotel's photobooth developer quality in 2015

I put this photobooth collage together for Priscilla and zooming out, I noticed that this is a great way to get an overview of how new the developer is at Ace Hotel's various photobooth locations (these are taken at Portland, Palm Springs, and NYC Ace Hotel locations). I guess there are some weeks (months?!) where nobody bothers to change the developer at all (sooooooo yellow).