The 2012 Freelance Industry Report has some great information. Yes, I know it is 3 years old, but if you have not read through this report, you really should. I am putting a link here so you can download it.
This report can provide you loads of information on the way freelancing is becoming a normal standard around the world. It is from this report that I developed the following infograph:
There is a lot of great information in this report, and I will probably use it for upcoming posts.
Download it and see why freelancing is taking over.