Android Lollipop is runing on 10% of devices

Google released the Android distribution stats for the month of April.

Android 5.0 is now present on 9% of all devices, Android 5.1 Lollipop has a share of 0.7%

The distribution gains of Android Lollipop have come mostly at the expense of KitKat. Android 4.4 has dipped to 39.8 %.
Android Jelly Bean and its various flavors have barely dropped their distribution share in April. combined, the outdated versions run on almost 40% of all Android devices out there.
 Android Ice Cream Sandwich can still be found on 5.3% of all devices. Android 2.3 Gingerbread on 5.7% of all Android hardware.

Source