From the US Department of Education:
The national graduation rate for public high school students rose to a new high of 83.2 percent in 2014-15, according to data released today by the National Center for Education Statistics. This adjusted cohort graduation rate (ACGR) measures the percentage of students who graduate with a regular high school diploma within four years of starting 9th grade. The ACGR has risen by about four percentage points since the data were first collected in 2010-11.
The data released today show that between 2010-11 and 2014-15, graduation rates increased for all reported groups of students, including all racial and ethnic subgroups, low-income students, English learners, and students with disabilities. However, graduation rate gaps persist among the racial and ethnic subgroups.
From 2010-11 to 2014-15, the ACGR has increased 6 percentage points to 76.1 percent for low-income students; has increased 8 percentage points to 65.1 percent for English Learners; and has increased 6 percentage points to 64.6 percent for students with disabilities.
To view the full data, please visit http://nces.ed.gov/ccd/tables/ACGR_RE_and_characteristics_2014-15.asp.
From the White House:
Year-by-Year Data: National Center for Education Statistics