I don't know of any guide that shows the average battery life per charges. I don't think 99% is an odd number though considering that the battery life should probably not be at 100% since it has been used.
The battery life % number is a mystery. I wouldn't worry too much about it- at least I would favour mah recorded as last known capacity and the absence of major cell deviations in flight as reliable indicators of health and expected performance.
as soon as you fly 1 inch the battery go down to 99% since it has been use I have batteries that I have charge for 60 time and they are 88%
I think batteries can be charge 300 time
Don't look at the battery life numbers, your focus should be mainly on its capacity. Also note that these numbers are NOT very accurate, they are just estimates based upon certain parameters.