Removing 1 Item from the Data Table Below a Chart

Hi

I tried searching and I can't anything related to this topic. Hope you can help.

In a line graph, I have three series--one is the goal, one is 2012 data, and one is 2011 data in grey.

I have added data labels to the 2012 line so that's taken care of. I only want to include 2011 data in the data table below the chart. How can I do that? If I add the data table, I have all three series and I can't remove any one of them manually.

Thank you!!

Using Excel 2010 and Windows XP