I wish this was true but the little buggers have been fairly busy in Australia this year. Some attacks that come to mind are; man taken on knee board being towed behind a boat; a couple of surfers taken on the surface; and most recently a marine biologist taken at surface heading for his boat in scuba gear [5klms.off shore in South Australia].
The big three to be wary of are Great Whites, Tiger Sharks, and Bull Sharks. You avoid the first two by not diving in their waters [Tigers are little less predictable, but Great Whites are so rare that you really have to go looking for them]. Bull Sharks are a bit more scary. They travel from salt water into fresh water fairly comfortably, love murky waters [i.e.inland rivers] and are aggressive. They are responsible fo attacks on dogs and people swimming in frsh water estuaries and rivers in Queensland, Australia.
As I have said in other posts, there are lots of places to dive where you are extremely unlikely to encounter one of the big three - so just do your research and be conservative.
Personally I love diving with sharks - on the evolutionary scale of perfect design for their given profession [killing stuff] they are nearly perfect.