In 2008, a survey of 1,894 people in the Individual Giving Survey of the National Volunteer and Philanthropy Centre showed that 23 per cent of youths aged 15 to 24 were volunteers, the highest percentage among all age groups. Under last year's Citibank-YMCA Youth For Causes initiative, one SMU team organised a 5.5km barefoot walk after witnessing Cambodian children in Phnom Penh going through garbage without any shoes on.