Oregon lists its Search and Rescue statistics every year and I've been told that other states do, too. It would probably take a lot of googling to find them! Oregon's stats keep being cited by Portland Mountain Rescue every other year when a bunch of city legislators start clamoring about charging for mountain rescue. I didn't bookmark the site, though, and the legislature won't meet again until 2013.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey