when your calling coyotes, what percentage are you successful in calling them in? I mean what percentage of the time do they "show up"

Depends on the day and the conditions- about the time you think you really have it down pat- nothing showws up.

Trashcanman: I will answer your question this way - or these ways more specifically!
When conditions are good here in the Rockies and the high plains I am pleased when (at night with spotlights and during the day) Coyotes show up at 1 in 4 or 5 set ups!
When conditions are poor (windy, no snow, I am new to the area, easy access country to all Hunters, its past early morning or before near sunset etc) then I am happy to see Coyotes at 1 in 8 or 10 set ups!
I also do some spot and stalk Hunting and some stand Hunting of Coyotes and if I get one per Hunt like this, I am happy!
There are a lot more Coyotes out there than we callers and Hunters realize! I have purposely flown low over valleys here in Montana, in small planes, and am amazed at the number of Coyotes I see down there!
I have a friend who is a trapper and he also has a special permit to "nuisance trap" year round for Beavers, Coyotes and animals that are troubling folks. He trapped 325 Coyotes in one valley (about 70 miles from me), in one year a while back! That year a friend and a fellow Coyote caller (who was not aware of this "harvest" by my trapper friend) approached me. My calling buddy raved about the Coyote Hunting in this valley and I was hesitant to go along to this valley with him when he invited me. I knew how many Coyotes my other friend traps there every year!
We went up there anyway and before we had even set up once that winter afternoon we had seen 3 Coyotes mousing out in the fields from our truck!
Again my point is there are way more Coyotes out there than most folks realize!
You (or I) may not get Coyotes to come in but if there are mice or rabbits or Ground Squirrels (or other Colony Varmints) in the area there ARE enough or WILL BE enough Coyotes for our Hunting pleasures!
Keep after them!
Hold into the wind
VarmintGuy

It is really hard to put a number on this. Some areas are called a lot and the yotes seem well educated. In these areas I don't have much to brag on & have even seen them (pair) mousing toward me. I waited until they went into a small draw then moved into a better position. With favorable wind, cover, and knowing they were there I started to call. They looked me over real close and one even layed down to watch. I'd never seen this so I messed around to see what response I'd get. They made no move to leave or come closer until I blew a challenge call on my yipper. They stood up and walked over the ridge. I got up and walked to the truck, drove around the hill and walked up a draw that headed back at them. I got another chance as they passed through but they made no effort to come in.

In other areas that get left alone, I've had them run full tilt at me and nearly jump in my lap! Nate

Sometimes my percentage is zero......other times my percentage is a couple hundred percent (more than one dog to the stand). Overall more than 50% of the time I have dogs coming in and I expect that I have been busted and never knew others came in at all.