Export the data using the built-in Export Playlist or the better MC XML Export plugin. You can then choose to create the graphs with Excel, Access, SVG/HTML, or something else.
Excel would be easy, but you'd need to adjust the graph every time you do a data transport or build the graph extra big. Access might be nice and there's already a preset for MC XML Export that will help you get it in.
SVG would be the best bet, but you'd need to learn it first and then write XSLT that goes from the exported data to HTML with embedded SVGs. I once gave some thought to doing this, but it became a little disheartening to see no built-in MC support for doing the transformations. Would JRiver add this, it would be a very slick ability indeed. Imagine... from within MC, select the data, export the XML, do the transform, save the transform, and MOST IMPORTANTLY, render the HTML within MC itself.