Thank you for the replies.

From the following weblink, one can find the salary survey for Swiss IT industy (in German) updated each year.
http://www.swissict.ch/63.html?&L=2

Salärumfrage (salary survey)
The survey is divided by position, region, experience and age.

To order the survey, you much regsiter (free), and the salary survey can be paid via credit card and delivered as an e-mail attachment.