In 2011, 31 percent of eighth-grade public school students in the United States scored at or above the 'proficient' achievement level, with the District of Columbia having the lowest percentage of students at that level and North Dakota having the highest share. Read the related story and analysis.
* Advanced achievement level percentages for District of Columbia and Mississippi round to zero.
NOTE: Detail may not sum to totals because of rounding.
SOURCE: National Center for Education Statistics