Dynamic (autoupdating) BAR Chart to use the Sum of Values for dates

Say I have column A for dates, column B for numerical values:

A | B
3/10 | 1
3/10 | 15
3/11 | 25
3/11 | 3
3/12 | 5

I want my chart to automatically update (when I create a new row) and use the sums values in column B per column A's unique dates.

eg:
3/10 -> 16
3/11 -> 28
3/12 -> 5

How would I go about doing this? I'm just so lost...

Might I suggest separating your data entry and your source data?

In the attachment, the Source Data worksheet uses formulae to pull the required values out of the Data Entry worksheet.

I hope this helps