Browser Usage - Web Statistics & Trends

In my pursuit to update my internet knowledge, I thought it would be important to check out some web stats... but where? And how accurate would those stats be? Would they be up-to-date? I found what I was looking for on the W3Schools web site. Not only am I able to brush up on my coding, but the web site provides a monthly breakdown on web statistics and trends, dating back for the past six years. There's also info about OS Platform statistics. Oh, and being part of W3, it's free.