Android 2.1 now in more than half of all Android phones
The other chart is a graphical look at what percentage of Android devices are compatible with a certain build. For example, if you are a developer and you produce an app for the build at the top of the chart (which is Android 1.5 and moves down to the more recent 2.2, the darker green sliver at the bottom), you will have support for 100% of Android devices. Use the X-axis to determine which build you aiming to produce an app for and then move over to the Y-Axis to see what percentage of Android phones you can reach. The figures are determined by the number of devices within a certain build that entered the Android Market during a two-week period ending with the date on the X-Axis.