How often do i have to change the timing belt on my peugeot partner 1.9 diesel van 1997?

how many miles before replacementHow often do i have to change the timing belt on my peugeot partner 1.9 diesel van 1997?
As a rule most timing belts should be changed between 60,000 and 80,000 miles (100 %26amp; 125 Km).