Have not put out anything this year - at least on our hunting property.
Since I live in a mountain sub-division, with no hunting allowed, we have a rather large herd of deer that lives here with us (or, perhaps I should say that we live here with them - they were here first.) I generally put out a block of salt at the far back side of my property and the local deer frequently stop by and lick or nibble on the salt - yes, often several at a time.
Am reminded of an event that happened many years ago. Had an old bag of rock salt that we had been using to make home-made ice cream. Since the bag had been opened for a good while and was starting to clump up, I decided I'd just dump it on our hunting property so the deer could work on it. During that spring gobbler season, I took the rock salt along one day and just randomly picked out an old rotting stump and dumped the entire bag over it. Almost forgot about it until 4 or 5 months later when bow season open. Walking back to our camp one day, I remembered the rock salt and thought I'd take a look. Man! was I surprised. Not only was the salt gone, but the stump itself no longer existed, and there was about a 6 inch hole in the ground where the stump had been. I guess over the course of the summer, the rain had desolved the salt and it had soaked down into the rotten stump, but that didn't stop the deer. They had actually completely chewed up the dead wood in the stump and even dug out or ate the soil were the desolved salt would have been.
It is my understanding that deer can usually satisfy their salt requirement from their normal forage and browsing, but if there is a centralized salt source available, they will take advantage of it, and I believe they hit the mineral sources (including salt) hardest during the spring and summer months, when nursing young or growing antlers.
Certainly one very resourceful creature.