Excel 2007 : cluster analysis

hey exp.

i have an ark, whit some convenience stores, in the ark, are the expected sales for weeks.
i would like to make some clusters, that can show me that in week 25 these stores are in plus 110 % and so on.

most preferable whit same look as now, joust that it will show, the cluster whit the lowest % and so on.
do i need a macro, and if so do some of you now how to make it.

ore is the a formal that i can use ?

o the will be a lot more data in the final ark, this is joust a demo. but the data will be in the same place ...