How bad do your teaching evaluation scores have to be before you should leave them off your resume? I got a 4.0 out of 5.0 on my teaching evaluations.  The average grade in my department is a 4.5.  Should I put this on my CV/resume?

For reference, I am a PhD student and this is the first class I've taught.
In my experience, people don't generally put teaching evaluation scores on a CV at all, regardless of what they are.