How to find AD attributes that are empty for all users in AD

Hi, guys.
I am sure that some attributes (like FAX or City for e.g.) are empty for all users in my Active Directory.
Is it possible to find (and to count) users AD attributes that are empty for all users in AD?

Get-aduser -ldapfilter ‘(!(city=*))’ -properties city

To Expand on Tom’s reply, pipe it into Measure-Object to get a count

Get-aduser -ldapfilter ‘(!(city=*))’ -properties city | measure-object