I don't really know, but I have a 99 model M5 I'm looking to sell for the new M3, and have noticed that the majority of Oz cars up for sale are 99 and 00 models. So this might be an indication that there were a lot of Oz sales when the car was first introduced as you would expect an even spread of years as it has been discontinued for a while.
If you are looking for a Carbon Black low Kms car in excellent condition with the prestige leather pack, PM me
Regards,
Dean