Sharks attacked five people worldwide in 2008 , Florida researcher says . Four people killed by sharks last year . Economic downturn means fewer people visit sharks , researcher says . Fewer people , especially outside of the United States , have the resources to go to the beach , he said . Dolphins account for 57 % of shark attacks .
Sharks attacked five people worldwide in 2008 , Florida researcher says . Four people killed by sharks last year . Economic downturn means fewer people visit sharks , researcher says . Dolphins account for 57 % of shark attacks .