Personally, I would create my own groups of the x-axis variable, summarize the data such as with proc freq to get count and percentage variables and then use VBAR. That way I can easily control the datalabels with a format.
Going back more than 25 years and Proc GCHART, almost every attempt to use a graphic procedure calculated percentage left some problem if trying to create publication quality graphs, such as this format of displayed labels, that has no easy solution. So creating the actual values needed in a data set would usually let me have a value to display.
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