For eighth-graders attending public schools, the percentage performing at or above Proficient was higher in 2011 than in any of the previous assessment years. The percentage performing at or above Basic was higher in 2011 than in 1990, but not significantly different
from 2009.
Sample sizes were insufficient to permit reliable estimates for Bureau of Indian Education students in 1992–2003, Department of Defense students in 1992–2000, and other private school students in 2005-2011.