We’ve recently updated the charts found in the Testing Resources section, updating the stats to January 2015.
The charts available include:
These stats help both developers and testers to make decisions on what browsers, email clients, screen resolutions or Android versions they should be supporting and testing in.
The landscape does change over time and so keeping up to date with these updates helps to focus your testing on the browsers, email clients, etc. that are most important.
If there is a chart that you would like to see in Testing Resources then please let me know in the comments.