Formula for City-State tribute values?

Hello. I'd like to know what the mathematics are of the numbers seen in this screenshot. For example, how is "Overall Military Power" and "Military Near City-State" calculated? Are there upper limits?

http://cloud-4.steampowered.com/ugc/595884953751525229/1D393DAB98A7A22AC3A22F38367A4B837B779D6C/

Bump.