Engineer to machine ratio's

Had this question bugging me for some time so thought it would be interesting to conduct a straw pole on the subject. I seem to remember that back in the day of analogue Photocopiers I seem to remember the ration of about 150 machines per an engineer but we have moved on dramatically since then. Machines have got more reliable with longer times between service intervals and higher parts yields, however on the flip side of this machines are now doing higher print volumes and perform more tasks then just copying putting more wear on the machines and opportunity for breakdown.

So over to you guy's what are your thoughts on machine to engineer ratios in todays markets?