Report/Graph Improvement Suggestion

I mentioned I would like to see an average function for reports, similar to a subtotal. It occurs to me a good place to do this would be to show the average amount for the periods graphed on a report in the pie chart segment title box above the graph. For instance, you setup an expense for last 12 months by month and show the average per month (for 12 months) for each expense picked up by the chart. Some might also like to see actual amount per period, or total for all periods, so a selector for which to show in the box would be nice too.

Obviously, if you show too many expenses you might not be able to read the title boxes too well, but that could be fixed by having the report function show all selected expenses in groups of N on separate pages; the N being chosen like it is now for N largest.