The U.S. government produces limited data on sport participation and physical activity rates, and none on youth before high school age. In that void, the most robust data is generated through an annual household survey conducted by the Sports & Fitness Industry Association (SFIA). In 2008, 30.2% of youth ages 6 to 12 were active to a healthy level through sports, organized or unstructured; by 2015, that number had dropped to 26.6%, according to SFIA. Among 13- to 17-year-olds, the rate fell from 42.7% to 39.3%.