Add "Products crafted" stat per building.
When selecting a building I want it to show how many times it has completed a recipe since it was built. Factorio also has this stat.
It can be useful to know e.g. if buildings are prioritized in a row, does the last one even get used? or to know the ratio of recycled/ore used by a certain furnace. or to compare with the global stats to know what percentage of e.g. steel created was done in this particular furnace setup vs the other ones. or just for novelty.
This data would be lost when a building is demolished.