Echoing Michael's answer, the best way to determine market values for a particular time period is to contact a local, knowledgeable real estate agent who can give you both raw data and an insider's perspective on past and present sales. Most real estate listing sites available to buyers and sellers do not show you the sold property data, and knowing only the listing price can give you a wrong impression of pricing trends.
I'm a RealtorÂ®, and I live and work in Madisonville, TX - Midway's neighboring "big brother" city. My market area includes all of Madison County and surrounding areas. Feel free to get in touch with me! My contact info is available on my profile page.