Making a stacked column chart

[ExcelZen13]

Hi guys,

I have a question about making a stacked column chart and it would be great if you guys can help me out.

Right now, I have a huge data set in the form below:
For example,

Employee | Contribution
[TABLE="width: 500"]
<tbody>[TR]
[TD]Employee[/TD]
[TD]Contribution[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]10[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]20[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]50[/TD]
[/TR]
</tbody>[/TABLE]

Right now, I know I can do a sum of both employee A's and B's contribution and then make a stacked column chart based on that new table. But I would like to observe the employee's contribution in the order specified above.

Meaning, I would like a one-column chart where the base column is made from A's contribution of 10, and B's contribution of 20 is stacked on top of it, and A's latter contribution of 50 is stacked at the top.

Is there a way of doing it?

I have a dataset of employee's contributions by the hour and each hour is the table above. So I would have a column chart where each column represents a specific hour and I get to see their contribution behavior in the order specified.

Thanks guys!