How much of Australia is susceptible to bushfire in each of the seasons of the year?
http://www.google.com/search?q=australia+wildfires+susceptible&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
There are several articles linked here that discuss the different regions of Australia which are susceptible to wildfires. If you want to find out about specific areas of Australia, just alter the search terms at the top of the search results above.