Most of the population ( as of 2000 ) speaks German ( 85.4 % ) , with Italian being second most common ( 4.8 % ) .
Portuguese being third ( 2.2 % ) .
Most of the population ( as of 2000 ) speaks German ( 85.4 % ) , with Italian being second most common ( 4.8 % ) and Portuguese being third ( 2.2 % ) .