Searched for https://www.unesco.org/en/search?f%5B0%5D=countries%3A135461c4-e851-57dc-9ffc-03499f284450&f%5B1%5D=year%3A2021 
Note: This calendar view maps the number of captures of https://www.unesco.org/en/search?f%5B0%5D=countries%3A135461c4-e851-57dc-9ffc-03499f284450&f%5B1%5D=year%3A2021, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.