It was added by Fixed Borders. I am unsure of it's meaning. We should ask Dexy.Can you tell what the number is next to my% means Afforess?
It represents the actual culture in that tile (per civ). Based on this those numbers the %'s are calculated.
I just like to know how much culture there is in the plot exactly, that's why I added it. It can be removed safely without changing the gameplay. In CvGameTextMgr.cpp, around 4500th line (in my version), just bring back the old code from the comments in two places.
However, if you don't remove it - don't get scared when the culture suddenly rises over 10000000 (10 mil) in some plots. This is how fixed borders actually work (using extreme culture). I might disassociate the culture from the borders in the future, but for now it works quite well as it is.