An outbreak of foodborne illness caused by a species of Salmonella was identied in patients from 12 states. Over 2,000 cases of GI disease were reported to the CDC, with 140 of the cases resulting in severe illness requiring hospitalization. All of the hospitalized cases were confirmed as Salmonella by culture tests. Of the people who were hospitalized, 15 died as a result of their illness. What is the case fatality rate for this outbreak?