Percent of 18 to 24 Year Olds Enrolled in College
Undergraduate Enrollment of 18 to 24 year olds / Estimates of the 18 to 24 year old population
National Center for Education Statistics (NCES), IPEDS Fall Enrollment Survey. http://www.nces.ed.gov. U.S. Census Bureau, Population Estimates
Data are reported bi-annually in odd number years, next data set available in 2009.