Here's a link to the Australian Tree Failure database.
Australian tree Failure Database
With all due respect to the producers of such and their intentional goodwill it's a chronic dead duck. Try get some data out of it? It's now 2008 and it was last updated 2004. Hmmm, maybe I should take it off their hands and fix it... but knowing how much effort it is for people to post I can see why they'd shun at filling that out.
Here's who needs to be completing that info, insurance companies and councils predominantly, I would say the bulk of failures would fall into those 2 buckets.