What is number of tablets? The total number of shipped Tablet? Why would it matter if those tablet are not in use? Which is what the stats from Stats-counter are showing.
Market share is how much money you make. So for example if apple sells 1M ipads for $500 and android tablets cost $50, at 45.57% it would mean there are 9M android tablets sold. Which makes the proportions more like 11% ipad / 89% android.
iOS is 54.33% of all tablets, Android is 45.57%. Microsoft, Amazon, and everyone else combined account for 0.1%
It doesn't seem like an ecosystem Google has the time to worry about.