The country of origin of members that join a site?

For example, is there a way for affiliates to see whether they have more sales coming from a specific country?

Also, does anyone know specifically if any VOD providers display this type of information as i have a hunch that more VOD/PPV sales are being generated internationally that from within the USA at the present time based on my experiences several years ago however, as of yet, i have no way of proving this hypothesis.

Regards,

Lee