Child abuse in the U.S. - total number of reported cases 1990-2010

Based on State submissions to National Child Absuse and Neglect Data System (NCANDS) of alleged child abuse and neglect. NCANDS collects case level data on children who received child protective services response in the form of an investigative or alternative response. Each state has its own definition of child abuse and neglect based on standards set by federal law. Child abuse is defined as any recent act or failure to act on the part of a parent or caretaker which results in death, serious physical or emotional harm, sexual abuse or exploitation; or an act or failure to act which presents an imminent risk or serious harm.
Data from previous years can be found here.