How Often Do You Change Your DM Piece?

I've been running the same direct mail piece for the past 2.5 years. They have been good, but they seem to be getting a little stagnant. I've been running into a lot of non-prospects, serial mailers, etc. So my question is how often do you guys change up your direct mail? I'm sure this has been talked about numerous times before, but I couldn't find it. Thanks in advance.
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