What's The Most Popular Halloween Candy?

This is usually the spot where I would tell you the answer. However, after exhaustive research, I still don’t know. This must be one of those unquantifiable questions. A few sites suggested that it is tootsie rolls. This makes sense because you can get it in big bags and it's quite inexpensive, so maybe that one is bought the most. I'd just assume that actual trick or treaters prefer chocolate candy bars but I can't get the hard scientific studies that I so desperately want to back it up.