Eighth-grade NAEP U.S. history achievement-level results
  
Findings
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The percentage of students performing at or above  Basic increased in 2006 when compared to 1994 and 2001.  
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The percentage at or above  Proficient was higher in 2006 than the percentage in 1994, but it was not statistically different from the percentage in 2001. 
* Significantly different from 2006.
NOTE: View complete data with standard errors. The percentage at Advanced in 2006 (1.16) was higher than in 1994 (0.74) but not significantly different from 2001 (1.28).
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 1994, 2001, and 2006 U.S. History Assessments.