Hi,

I need help with formula to calculate week on week and year on year
changes. for example the data is

Year                   8-Sep                       15-Sep       22-Sep
29-Sep
2009                    165.60  167.80  170.80
2010                    174.80  174.50  174.90

Every week one data (number) will be added to year 2010. I am looking
to formulate a report which will be as below:-

        22-Sep  wow     wow %   yoy     yoy%
Price   174.9   0.40    0.23%   4.10    2.40%

That, the report will populate the latest date for which data for 2010
is available(i.e. 22-Sep), populate that price, calculate week on week
change, wow percentage, calcuate year on year change and percentage.
Every week the formula should automatically incorporate the addition
data point.

please help
regards
Harris

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