This is a very odd data set. Macha's car sold for $146,000 18 months ago, yet the high sale in this data over the past five years was $80,800? This would tell me that this is not the place you want to market your coupe if you are selling it.I also saw this Coupe on Hemmings and went to the site selling the car called Classic.com
Here's the link
They have a market graph of recent sales and below that a "Comps" page that shows all of the E9's sold.
They list all types of foreign cars they have in places around the country.