The history of candies began in Ancient India, where it was often considered a form of medicine before the Industrial Revolution. Prior to the 1900s, candy was commonly sold unwrapped on street carts and exposed to dirt and insects, but after a 1916 polio outbreak, unwrapped candies received criticism for being unhygienic. Global candy sales were estimated at $118 billion in 2012, with $2 spent on chocolate for every $1 spent on non-chocolate candy in the United States.