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The DC Office of the State Superintendent of Education released figures today showing that 64.4 percent of students in the D.C. Public School system graduated in four years during the 2014-2015 school year—an increase of 6.1 percentage points from the year before. The city’s public charter schools also saw their graduation rate rise, growing 2.8 percentage points to 71.7 percent.

Together, 3,210 of 4,912 public school students in the District, or 65.4 percent, graduated from high school last year four years after they started ninth grade. That represents an increase of 4 percentage points over the 2013-14 school year.

“Today’s news is a testament to the hard work and dedication of our students, teachers, administrators and families,” Mayor Muriel Bowser said in a statement. “Graduating from high school with a high-quality education is an important step on the pathway to the middle class for our young people. While the District has made progress in recent years, we need to plow ahead and continue to improve our schools to ensure that all of our students have the knowledge they need to succeed in school and in the workforce.”

Bowser’s sentiments echoed those of D.C. schools chancellor Kaya Henderson during her “state of the schools” address earlier this month.

D.C. changed how it measures the high school graduation rate in 2012, moving to a calculation that tabulated the percentage of students who graduated within four years rather than the total number of graduates.