Adding cells of same conditional formatting
 

I have produced a risk register in Excel. Each risk is anaylsed and ends with
a calculated risk factor (a number between 1 and 400). I have used
conditional formatting to colour band each cell into one of four colours (for
example red for high risk factors).
I now wish to add a summary sheet that will display the number of risks in
each band. Can anyone offer any advise please?
Many thanks