Completely normal. You've used 10% of the 1000 cycle rating and it's dropped it 1% You'll be fine. Purchase date has little to do with this. It's how many cycles it's been discharged and charged. Mileage will vary ..

People are waaaaaay over concerned about their Mac batteries. I use my computer, it'll need a new battery someday. I'll buy a new battery when that day comes. Did you think that it wouldn't drop as time goes on. Just use the machine however you do, and enjoy.