Determining what orders are tax relevant in Woocommerce

Hey, I'm wondering what the best way is to determine what number of orders are legible for tax return?

Being based in the EU our client can claim tax back on any sales made to within the EU so they are looking for the easiest way to get these numbers.

We discussed exporting to Excel and making a rule for any non EU countries, but I'm hoping there's an easier solution I can offer them.

Thank you