I manually manipulate the chart to get the values to appear above the stacked bar.
* Type the totals as a separate data series
* Select the "totals" data series on the chart. Then, right click and change the Chart Type to a line chart (this should only change the "totals" data series to a line, the other data should still be displaying as a stacked bar)
* Right click on the "totals line", and select format data series
- On the "data labels" tab, select the radial button next to values
- On the "patterns" tab, select the radial button "None" for line and marker