Top N compare

Hello all!

Can anyone help me with a tricky table? I have a raw data table representing outstanding amount at specific dates in the following manner:

Dates(a) Client(b) Amount(c)

31/12 AAA 1000

31/12 BBB 1234

31/03 AAA 900

31/03 BBB 2345

30/06 AAA 1100

30/06 BBB 3456

So the objective is to create 1 Top N table on the first specific date and compare with the second specific date (both with amounts), which I can choose by slicer.

I managed to create such report only as a chart, but create the report as a table is too difficult for me.