This is not on the HUD anymore as far as I can see... I could only find it in the hiergamenon for that city. It would be easier to have it on the HUD.
edit:
Just checked again and it is only on the HUD for small newer cities that almost dont produce anything, as soon as a city produces tech, arcane and materials it does not show anymore. This is kind of annoying as this info is mostly interesting for larger cities! Furthermore, why isnt this info shown in the GUI at the bottom of the screen when you click in a city?
