New Zealand government agency websites tend to move content around at least once a year. Along the way a huge amount gets deleted.

I know this because I frequently link to sources from my news site (billbennett.co.nz) and every week I check the links. Most weeks one or two links break. This week more than 40 are broken because of yet another rejig of the Commerce Commission web site. Some are redirected, but can look broken if the redirects are slow or involve multiple steps.

Also this week a major US research company has changed the URLs of all its archive material.

There are ~6000 external links on my site, only 1% broke this week, but if the same number broke every week, the total would halve in a year.