How to calculate unemployed citizens in a city?

[Scissor_fingers]

I'm trying to design a UB that replaces the Zoo that gives +2 happiness and a +5% gold bonus per unemployed citizen (capped at 25%).

I'm currently stuck on how to calculate the unemployed citizens in a city as an integer in lua.

Can someone help please?

 

[LeeS]

http://modiki.civfanatics.com/index.php?title=City.GetSpecialistCount_(Civ5_API)

local iCityUnemployed = City:GetSpecialistCount(GameInfoTypes.SPECIALIST_CITIZEN)