What is the fastest growing vending business in the US?

What is the fastest growing vending business in the US?
"Cantaloupe Systems Inc can be considered the fastest growing vending business in the US since according to VendingMarketWatch, they have been voted as the fastest growing vending business as one of hundreds of the ""Fastest-Growing Private Companies in America"" by Inc Magazine, and CS Inc is the only vending business in the list."