how to align text to each bar in the bar chart?

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I want to add N value to each bar in a bar chart. Normally people move each N value manually to the bar as indicated in the attached file. is it possible to let each N value align to the top of each bar automatically no matter how I resizing chart?

THX! Screen Shot 2014-10-08 at 00.24.05.jpg (53.87 KB)