At : Characteristics of Minimum Wage Workers: 2011 they say :
"In 2011, 73.9 million American workers age 16 and over were paid at hourly rates, representing 59.1 percent of all wage and salary workers."
There you go, 59.1% of people are paid hourly wages. That means therefore that 40.9% are paid salary. They exclude people who are self employed.
--