You should. And we have a huge audience of creative professionals over on Coroflot.com who can help you figure it out. The results of all this worth-knowing gets collected via questionnaire every year into the Coroflot Annual Design Salary Survey, and if you're a designer and haven't read it then you might be designing in the dark. Financially speaking.
The Survey love has been flowing on an annual basis since 2001, meaning that not only can you compare what you make with your kindred in other regions, fields, and work environments (staff Design Managers in Hong Kong are doing pretty well these days, for example); you can also look at changes over time, and see which fields are growing in pay at a steady rate (Industrial, Graphic and Interior Design) and which are taking off (nuh-uh, not tellinggo look at the survey).