My reasons for wanting this data are twofold:
1 - curiosity. I'd just like to see a historical trend of how rents in our area have compared to house prices and incomes.
2 - data modeling. If someone is trying to forecast the potential of a rental property and they factor in an annual rental appreciation of 5%, their model becomes invalid (in my opinion) if that city has never actually experienced that high of an appreciation. Because of this, I'd like my models to at least be in the ballpark when running numbers on local properties.
What I'm curious about is why you want to know. I ask because I wonder if you're making a common mistake of expecting the past to predict the future. Not possible. Just because home prices have been coming down for a couple of years does not mean they are going to come down next month.
So what use would you make of the information if it could be found?