Only last two digits of the year are shown--discerning the century

Re:  Zimbabwe, Archdiocese of Harare—Church Records, 1897–2021 [Part B][M3B2-78T].

This record covers nearly 125 years. When only the last two digits of the year are given--how can I tell if this is for the 1900s or 2000s?

Any suggestions on how to discern the century?