You can check overseas remittance history on PRESTIA Online .
MENU [Transfers] > [Overseas Remittance History]

When you need a record of overseas remittance, you can print a Copy of Your Payment Order available from the menu above and use it as, for example, "Documents Concerning Remittances" to apply for exemption for dependents living outside Japan.

How to check "Overseas Remittance History" 

Please see National Tax Agency website  for an outline of the exemption for dependents living outside Japan.