Best selling stand-up

Was just wondering if anyone could tell me where I can find either:

A list of the best selling stand-up DVDs

A list of the best selling stand-up tours

The best selling stand-up DVD from each year (Recently, obviously)

Thanks,
Harry

Difficult to get historic data but the current best-sellers on Amazon are:

1: Michael McIntyre (The Stand Up Collection)

2: John Bishop (J B Live)

3: Kevin Bridges (The Story So Far-Live in Edinburgh)

4: Frankie Boyle (If I Could Reach Out Through Your TV Screen...)

5: Lee Mack (Going Out Live)

6: Rhod Gilbert (R G and the Cat that Looked Like Nicholas Lyndhurst)

7: Stewart Lee (Stand Up Comedian)

8: Dara O Briain (This is the Show [Live])

9: Tim Vine (So I Said to This Bloke)

10: Alan Carr (Tooth Fairy Live)

Thank you