Please, can we get past the shark "attacks"?
It would be more accurate to call it a shark "oops", or a shark "my bad", than a shark attack. PSUSCUBA1313 used the word "encounter". That's probably the most fitting terminology. If sharks "attacked" everyone who has been bitten, what are the odds those people would be alive? If people were tasty, and natural shark food, they'd be goners. Most people who have suffered a bite are around because the shark spit them out. It's no accident that sharks have been proven many, many times more valuable as attractions for divers and tourists than as shark fins, or as a carcass hauled aboard an Aussie fish boat as a result of some misguided political stunt.