today Apple approved My App Statistics and it is available in the iTunes App Store now. This app was created in the hope that it would be useful to other developers who develop Android apps and sell them in the Google Play Store but use an iPhone as their daily driver. You can get all your sales data from Google Wallet and get them presented in the app including some graphs.
The full description can be read on the product page here.
Or you can head over to the iTunes App Store directly. The app is not free and costs 2.99€ / $2.99: