Reporting revenue from new customers...

I was wondering if anyone has been able to produce a report for revenue that has come from new customers? The "New Customers" Report doesn't seem to do that.

It reports how many new customers have signed up and then it displays the total of new orders - but these orders are also from existing customers - for example, domain renewal orders.

I would like to be able to identify the revenue that is coming in solely from new signups.