`` We 're putting so many people in the water that humans are dictating the shark attack situation , '' he said . Sharks attacked Four people worldwide in last year , the United States researcher reports . 59 people killed by sharks last year . Economic downturn means fewer people hitting beaches , researcher says . Surfers account for 36 percent of shark attacks .
Sharks attacked Four people worldwide in last year , the United States researcher reports . 59 people killed by sharks last year . Economic downturn means fewer people hitting beaches , researcher says . Surfers account for 36 percent of shark attacks .