home, 0.5% walked to work, 0.4% used public transportation (excluding taxicab), and 1.7% used other means to travel to work. The average commute time for workers is 32 minutes. Fitch, Moody's, and Standard & Poor's rated Deltona bonds as "AA-" between 2013 and 2014. Fitch attributed Deltona's small commercial sector to the city being a "largely residential and mostly built-out community", but did acknowledge the city's improving unemployment rate, dropping from a peak of 12% in 2010 to 6.4% in June 2014. , the largest employers in the city include Daytona State College, followed by Publix Supermarkets, and Walmart. Education According to the 2010 American Community Survey, 14.2% of all adults over the age of 25 in Deltona have obtained a bachelor's degree, which was below the national average of 27.2% of adults over 25, and 84.7% of Deltona residents over the age of 25 have earned a high school diploma, as compared to the national average of 85.0%. Deltona had approximately 11,877 students enrolled in its public schools in the 2012–2013 school year. Three private schools are located in the city, offering both primary and secondary education. Higher education is offered by Bethune-Cookman University and Daytona State College through satellite campuses located in the city. Public primary and secondary education is handled by Volusia County Schools (VCS). VCS operates 2 high schools (Deltona High School and Pine Ridge High School), 3 middle schools (Galaxy, Heritage and Deltona Middle Schools) and 7 elementary schools within city limits. One elementary school is located in unincorporated Deltona, and four public schools in neighboring communities serve outer portions of the city. In 2010, the Florida Department of Education awarded all public elementary and middle schools in the city "A" or "B" grades based on their performance on the Florida Comprehensive Assessment Test. In 2013, both public high schools in the city received a "B." Elementary schools Deltona Lakes Elementary School Discovery Elementary School Forest Lake Elementary School Friendship Elementary School Pride Elementary School Spirit Elementary School Sunrise Elementary School Timbercrest Elementary School Middle schools Deltona Middle School Galaxy Middle School Heritage Middle School High schools Deltona High School Pine Ridge High School Private schools Deltona Adventist School Deltona Christian School Good Shepherd Academy Trinity Christian Academy Additional public schools serving Deltona University High School (in Orange City) Enterprise Elementary School (in Enterprise) Osteen Elementary School (in Osteen) Volusia Pines Elementary School (in Lake