Dave,

I do not know Perth but I found the site below to be very useful for statistics in your area of interest (and are FREE): just select the suburb you are looking to buy in an you will see a graph showing the median price growth from 1998 to 2002 and the growth in %.

http://www2.reiwa.com/content-suburb-detail.cfm?StatsID=19

Cheers,
Nina

One more to look at:

http://www.noagentsproperty.com.au

Nina