What is a good clickthrough rate?

Factual Questions
1

I’ve been doing various Google searches and I haven’t been able to come up with anything very helpful, but I was hoping the geniuses of the Dope could help me out with what advertisers consider a good clickthrough rate for banner ads on a website.

Thanks in advance.

2

Try average click-through rate banner - Google Search

3

Thank you, I never tried that combination of words and that brought up some decent sites.