Cannot produce a summation of values of a particular column

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Hi team,

 

      I have created a pivot table consisting of attributes and values as percentage, in which I want to calculate grand total of values of a particular column by right clicking on that row/column and clicking on 'Show Total'. But here as I am right clicking on the row , the 'Show Total' is not being displayed. Hence , I am unable to calculate the summation of the values. I have uploaded an image of it. 

Please suggest me how to get through this or are there any other alternatives.

 

Thanks

 

Ankan