Your question is a little unclear. How many different providers or how many times with a provider during the year. I, myself, average about 1 per month, but only see a few different ladies.
Celeste and WoWNikki are plenty for me, but I may wander once in a great while.

Re:How many providers so you guys see in one year?

So far this year, maybe 15-20 different MP girls and 3-4 from the Chicago Club in TJ.

I have about two or three appointments in a month, but some of those may be with the same woman.

About 14 different providers.

I see one every week.  I have 2 favorites who I see on alternating weeks.  If I get some extra WAM (walking around money) I'll see someone new, generally about 1x per month.

Doing the math, considering what happens with my SO, I get laid about 100 times a year.  But, I don't think that's what you were asking.

I have my top 3 ladies that I see most often.  My top 2 I see them at least once a month.  I see my number 3 lady once every two months.  This way I don't get too attached to a single one and always have a backup.