Excel 2007 : Making Line Graphs Start at Zero

Dear Excel Forum Communtiy

I am attempting to graph data on stock performance over a 5 day period but having trouble forcing all of the lines to start at the zero (x-axis). Essentially, what I have successfully completed is a line graph with all of the proper points but I want to force all of the lines to begin at zero. Right now they start off floating at the first day's returns.

For reference I have attached two jpegs to show how it is and how I would like it to look (I used paint)

Thank you so much for any help!

Post a workbook that shows the data and the bad graph.