Hi,
i have a stacked bar chart, similar to this:
http://www.roseindia.net/chartgraphs...BarChart3D.gif
What i need is a trend line, similar to this:
http://support.sas.com/kb/35/addl/fu...dout_trend.gif
that shows the average of the bottom bar to date.

is this doable in excel??
appreciate any help, or solutions to ismilar problems