How can I activate the Percentage in Data Labels Tab? It is grayed out. I
am using a stacked column chart. For example, one column is totaled 270. In
that column is two numbers, which are 142 for males and 128 for females. I
added the value in Data Labels Tab to display the numbers (142 and 128) in
that column. I also want to display percentage along with those numbers,
but it is grayed out. Why is it grayed out and how can I display the
percentage in that tab?

Thanks.