Polly Klaas Foundation claims only 100 children abducted by strangers per year: http://www.pollyklaas.org/about/national-child-kidnapping.html Um what?

"99.8% of the children who go missing do come home. Nearly 90% of missing children have simply misunderstood directions or miscommunicated their plans, are lost, or have run away. 9% are kidnapped by a family member in a custody dispute. 3% are abducted by non-family members, usually during the commission of a crime such as robbery or sexual assault. The kidnapper is often someone the child knows. Only about 100 children (a fraction of 1%) are kidnapped each year in the stereotypical stranger abductions you hear about in the news. About half of these 100 children come home. National Incidence Studies of Missing, Abducted, Runaway and Throwaway Children -- 2003

Every ten years or so the US Department of Justice conducts a study of missing child cases in the United States. The most recent, NISMART II, was published in October 2003."