I hadn't a clue what was going on... So I had to dissect your first formula, to understand what you were doing. For what it's worth, it could be simplified a bit (array entered):
=IFERROR((LOOKUP(10^10,A1:T1)/INDEX(A1:T1,LARGE(IF(A1:T1<>"-",COLUMN(A1:T1)),10)))^(1/(10-1))-1,"")
now to your problem....
What formula have you used for annual growth rates ??? (spot the analytical chemist who knows stuff-all about financial functions)...
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