adding percentages to stacked bar charts

[LaurenA]

I have a stacked bar chart that I would like to add percent
labels to. When I click on the chart options and go to the data labels tab,
the 'percentage' box visible but it is greyed out and is not an option. Is
there a way I can display the percentages on this chart?

Thank you!!

 

[LaurenA]

Thank you Andy! It's too bad it's not an automatic feature.