Hi,
do you know what is the percentage of english speaking people living in Switzerland?

Do you mean native English speakers? Because many people in Switzerland speak English, just not as their first language

Check this post out Is it April 1st? (English as offical CH language)

This might help.

I mean English speakers, but I will also be curious to know aproximatively how many Swiss people speak english?

thanks Blonaybear but it is not a lot? Do you think this number include students, expat, etc?

The stats are from the census and refer to residents so that would seem to be all those who had a residents permit.

Not exactly official but it may help.

http://switzerland.isyours.com/e/cou.../language.html

ok thanks for the info but I really find this number low