Cannot produce a summation of values of a particular column
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.