Serial publications such as journals and annual reports do not qualify for an ISBN and would usually have an International Standard Serial Number (ISSN).
An ISSN is a unique code used to identify newspapers, journals, magazines and periodicals of all kinds including annual reports.
You can find more information from the ISSN International Centre. The National Library of Australia is the only agency authorised to allocate ISSNs for journals, newsletters, annual reports etc. in Australia. UNSW Library can’t allocate ISSNs.
If you require an ISSN, contact the Australian ISSN Agency.