Well that seem to give you the information you needed. I have also noticed that the top 3 browsers have been changing in ranks in different blogs and websites though it has been a tough competition between those. Please note that the image shown above is taken from the same blog and just belongs to two different set of time periods(top picture- longer period and bottom picture-shorter period). While looking into mobile phone browsers I noticed that there has been a rapid increase in user base who search from mobile phones which shows the growing trend towards mobile browsing.
When looking into the operating system, windows seems to be still dominant over others. And the results have been similar in other blogs as well.
Hope that gave you a hint on how to prioritize and proceed with your design optimization for browsers and cross compatibility.
Please share your comments and views on the same.