Charts Top Songs and Top Albums please help!

Hi,
Does anybody know exactly how the charts "top songs" and "top albums" are put together on itunes?
Are there differences from one country to the next?
Are multiple purchases of the same item from the same account counted in full for the charts? or is it the case that only the unique purchases for each account is counted in compiling the charts, excluding multiple purchases from the same account ?
If only unique purchases are counted for each account, what about gifts? at what points songs sent as gifts are counted in the charts?
please please help

Sites like the iTunes Store generally do not document how such listings are complied so as to prevent record companies and/or artists from "gaming" the system and working out ways to get their tracks listed higher. So other than guesswork, no one here can answer your questions. Sorry.

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