I think it depends on the car it is attached to. Here's a couple of answers to similar questions in the past:
"Go to this site:
http://www.michelin.co.uk/car/
and choose the tyre selector. You can then choose your car type and model from drop down lists. You then get all information about the correct tyre for that car and also the correct tyre pressures" (from rinkytink)
and
"if you open the driver's door and look on the doorpost (locking side) you should see a sticker which tells you the pressures loaded or unloaded." (gazzawazza)