When do i change my timing belt on a 2000 audi a4 2.8?

it currently has 132xxxkm. i have no record of history of the timing belt ever being changed by the previous owners!! can somebody tell me if its time to change it or not?When do i change my timing belt on a 2000 audi a4 2.8?i think the average time to change it is from 150000-200000km.When do i change my timing belt on a 2000 audi a4 2.8?supposed to be every 80K miles but I would just go until the Performance was compromised or until I heard the belt squeel.