38% of webpages that existed in 2013 are no longer accessible a decade later
...
23% of news webpages contain at least one broken link, as do 21% of webpages from government sites. News sites with a high level of site traffic and those with less are about equally likely to contain broken links. Local-level government webpages (those belonging to city governments) are especially likely to have broken links.
54% of Wikipedia pages contain at least one link in their “References” section that points to a page that no longer exists.
See the full story here: https://www.pewresearch.org/data-labs/2024/05/17/when-online-content-disappears/