Calculate conditional formatted column

[RiRo]

Hi Members!

I have a Report List, which has multiple columns, which are conditional formatted if the value is high or not.
Now I want to create a percentage value for each column at the bottom of the list, which calculate the percentage of all green items against all items in this column.

I could make a seperate column in which i can calculate that, but maybe you know a better way to do that?

Thanks for your help
Rob