Appreciation Rate History: How Can I Get This Info???

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Alright guys, question of the day!!

I've been searching for days trying to find a source to get appreciation rate history for a town I'm interested in investing in. I've only been able to hunt down two sites and that gave me this year's rate and last year's. Is there a source that will give me the last 5, 10 even 20 year rates to compare? I tried checking my county's website and struck out there as well. Or are RE agents the best way to obtain this information?

Thanks!!