|Are you asking how to find the % difference for each set of values in each row?|
If so, just hold your cursor over the black box in the lower right corner of the cell that has your formula. Once it turns into a plus sign, click, hold and drag down the column. It will autofill the column, changing the row used in the formula as it goes.
BTW, the correct formula to find the % difference between 2 values is: