The five privately operated hospitals in Solano County are responsible for more than 11 percent of the local economy—and could grow even more important in the future—according to a study released Wednesday. The hospitals pay almost $319 million annually in wages, with 4,085 employees in January 2012 accounting for slightly more than 2 percent of the total employment payroll in Solano County. Annual revenue from hospitals represents more than 7 percent of total revenue generated by Solano County businesses overall.