How to add percentage column in views I use Views Aggregator Plus to calculate sum of a column.

----------------------
Item  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Data
----------------------
A &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20 
B &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 30
C &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 50
----------------------
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;100
----------------------

Then I want to add additional column for percentage. 

-----------------------------------------
Item  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Data  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Percentage 
-----------------------------------------
A &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20 
B &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 30
C &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 50
-----------------------------------------
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;100
----------------------

I know Global:Math expression. But I don't know how to get the sum, the sum field is not available. Only [value], [value_1] and [value_2] available for A, B and C respectively.

Is there a way to add a percentage column?
Now this problem has been solved, after VAP add percentage function
http://cgit.drupalcode.org/views_aggregator/commit/?id=2539ac5

Now I can add additional column calculating the percentage (as an example below):