Sentencing Commission data reveals that judges impose below-Guidelines sentences in roughly 51% of sentences in the Eleventh Circuit and nationwide for child pornography offenses. The average variance is approximately 40% below the advisory Guideline range. See the link below to access the Commission's data tables.
http://sentencing.typepad.com/sentencing_law_and_policy/2010/06/fascinating-data-on-recent-trends-and-circuit-specifics-for-federal-child-porn-sentences.html
-NK