The Sarasota County School District dropout rate for last school year improved compared to the previous year, but the graduation rate decreased slightly. Charlotte County’s graduation rate fell by 3.7 percentage points and its dropout rate was unchanged, according to the Florida Department of Education figures released this week. The Englewood Sun reports graduation rates are calculated by tracking the number of students who start in a public high school as freshmen to the number of students in the same class who graduate four years later. The dropout rate indicates the number of students who drop out in a single year.