What it shows is that the professional developers have not adopted the Android platform as much as the Apple platform. Now this is totally expected IMHO given the fact that Apple has had several years longer to attract developers.
There is no question that as more Android phones are released, and the OS becomes more popular, we will see a big increase in both the number of applications available in the Android store as well as the number of paid apps available.
The Apple store is certainly more mature than the Android store. So it isn't unrealistic that the Android store will start to see much higher growth numbers as more and more developers come on board and start duplicating may of the apps already available with Apple.