Take a look at this. Column Y. I set it so that it doesn't necessarily have to be a 5 year average. The formula in Y7 is an array formula (use CNTRL SHFT ENTER instead of just enter)where "Dataset" is a defined named range. Is this what you wanted?![]()
=AVERAGE(OFFSET(INDEX(DataSet,MATCH(Y2&Y3,$A$2:$A$77&$B$2:$B$77,0),MATCH(Y5,$C$1:$V$1,0)),0,0,Y4-Y3+1))
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