I have posted waitlist data if available since 2018 so you can see how much it varies from year to year. Unfortunately, UCD has no updated CDS information since 2020-2021 so the numbers I have posted were from the UC Counselor conference.
Here is the link: http://talk.qa.collegeconfidential.com/t/uc-davis-freshman-class-of-2027-waitlist-appeal-thread/