Powerconnect 6248 Route Preference

I have about 8 or 9 static routes configured all with preference 1 in my powerconnect 6248. I want to change all of them at once to like 10 or 20 so that I can at least have some wiggle room to add some one off preferred routes.

Is there a command I can run that will change all of these routes at once to lets say 20?