I track how much candy we give out each year so I know how much to buy and it's been a steady decline.
We had five door bell rings with one group showing up while I was still at the door, so call it six groups. We gave away 48 pieces of candy, including the first kid who grabbed about 8 pieces. (I let them reach in and take as much as they want and since it was raining I figured it would be a blow out. Otherwise I think three or four is enough). The first year we tracked it maybe twenty years ago, it was about 140 pieces.
Personally I had about five pieces plus a root beer shake with a little Kalua in it. I friggin LOVE Halloween and the whole month of October for that matter.