This is the new command in EDU, which is supposed to influence how frequently or infrequently the AI decides to recruit this unit. So far, 0 seems to be the neutral setting, as for peasants; Prussian Archers (I'm using the teutonic campaign) are -10, probably indicating undesirability; dismounted ritterbruder have 35, and cavalry ritterbruder have a whopping 90.
I'm guessing the number is referring to percentage, out of 100, to select recruiting that unit whenever it becomes available.
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