To find and export the rates list, you will need to look up the international rate cards assigned to the call plan you are interested in. For instructions on how to find the rate card, see here.
Once found, you will need to click on the "Rates" (ref. 1.) tab and the "Rates" (ref. 2.) section.
Specify the international "Rate Card" (ref. 3.) you are interested in and click on the "Export to CSV" (ref. 4.) option.