After Effects Data Driven Expression- Sum Total Spreadsheet Column Data

sum-total-data-column.js

rows =thisComp.layer("Data-Sample.csv")("Data")("Number of Rows");
total = 0;     
for(i=0;i<rows;i++) {         
if(thisComp.layer("Data-Sample.csv")("Data")("Outline")("Number Data")("Number Data " + i)) 
{             
total+= thisComp.layer("Data-Sample.csv")("Data")("Outline")("Number Data")("Number Data " + i);
}  
} total;