Hello All -

I have an excel line chart that illustrates performance of a groups of stocks purchased on different trade dates. So the x-axis is time (i.e. T+1) and y is % change.

I want to add labels to the line chart that illustrate % observations so that, for example, on T+30 only 30% of the group's returns have been observed. The difficult part is that the % obs. is not included in the data for the line chart....any ideas???

Thanks in advance.