<prompt> Translate the following text to EnglishKwa mujibu wa Shirika la Kitaifa la Utekelezaji wa Sheria, gharama za masomo ya sheria nchini Marekani ziliongezeka mara mbili kati ya mwaka 1991 na 2001.  <response>: Nationally, law school tuition doubled between 1991 and 2001, according to the National Association for Law Placement, based in Washington, D.C. 