Each year, about one-fifth of District of Columbia residents summoned for jury duty show up to court. That percentage has barely budged over the past decade, but new data show the court is making better use of jurors who do report.

Of the nearly 31,500 jurors who reported for duty in Superior Court in 2013, 80 percent were called at least once to a courtroom. It’s the highest rate since 2004, and well above the national average. The more efficiently the court uses jurors, the fewer people it needs to summon, judges say, and the longer it can wait before re-summoning jurors who already served.