The United Kingdom children's charity NCH has stated that demand for child pornography on the Internet has led to an increase in sex abuse cases, due to an increase in the number of children abused in the production process.[40] In a study analyzing men arrested for child pornography possession in the United States over a one-year period from 2000 to 2001, 83% had pornographic images of prepubescent children and 80% had images graphically depicting sexual penetration. 21% had images depicting violence such as bondage, rape, or torture and most of those involved images of children who were gagged, bound, blindfolded, or otherwise enduring sadistic sex. 39% had child-pornography videos with motion and sound.