Property Management Cost?

My wife and I have a house in Portland, Oregon we bought about five years that we are renting out until we plan to move there (maybe 10 years) to retire. We have been using a Property Management company to handle it since we are not in the area ourselves. They have been charging us 7% and just upped their fee to 8%, and were wondering what it typical for the area. We have been neither over or under-whelmed by the service and were not LOOKING to change Management services, but wondering if we should looking.