Hi thank you for having a look at my question. I have uploaded the file. The regional average is the centre point where I was wanting to create yellow green. red bands on either side. Over utilization may be just as bad as underutilization of various resources or prevalence rate ( under may mean there are not enough doc's available) . Again my thanks.Post an example file of what you're trying to achieve - it will save you and us time in getting to an answer.