[Neither of us have the data from 2008]

What?!  Do what I stated - Zillow DOES have property history for the past 10 years.  2017 - ten years = 2008.   You do now that Zillow is "the" top site for real estate values - right?

[and honestly I don't know what that would show]

WOW.   Have you tried to look at Zillow?   Apparently not - I can't really help you on this.  Perhaps you could find a young person who can navigate the internet for you?