The data for this graph is available as a NodeXL workbook. If you are a NodeXL user, you can download the workbook, open it in Microsoft® Excel® 2007 or 2010, and view the graph in an interactive window.

A few important points about downloading a NodeXL workbook:

• If you are asked whether you want to save the NodeXL workbook or open it, choose the "save" option. For security reasons, Excel will not open a NodeXL workbook that hasn't been saved first.
• NodeXL must be installed on your computer before you can open the downloaded NodeXL workbook in Excel®. If you haven't already done so, you can download NodeXL from here.