Played more turns with building Slavers Hut (also had barbarians on by mistake) I have founded second city, Slavers Hut not yet built. For 2950BC I get MapStat results. Tried new game no Barbarians. Built Workers House -> Warrior -> Slavers Hut (being built) and for 3600 BC I get MapStat results. EDIT: I built Slavers Hut started on another warrior and have settler moving to new city site. 2750BC, I get MapStat results.