Average open rates for communications at the U

I received a question from the Forum's chair elect Kelly O'Brien, who recently began a new CLA newsletter for faculty, staff, and student workers (mostly grad students, I believe) as to what are the average open rates (unique opens) for regular email updates/newsletters here at the U. I told her that for Brief, the number varies between 20-25% and has seen 30% on some occasions.

Matt Sumera in University Relations gave me stats on some recent high-profile emails, and those seem to average unique open rates of around 18%.

An interesting analysis on open rates by list size can be found at open rates by size.

For those of you who track your open rates, where do you fare?