BE350 pilot reports wingtip contact with parked aircraft while taxiing on the center line of Taxiway E at LWM; and claims Taxiway E clearance is inadequate.

Narrative

After landing on Runway 32 at LWM we turned off at the end on Taxiway E. After turning; we began performing our after landing checks during which my copilot noticed the close proximity of the left wing of our aircraft to an aircraft parked on the ramp. I immediately took corrective action which required taxiing significantly to the right of the taxiway centerline in order to clear the two aircraft parked on the ramp. Upon clearing this particular ramp area; we continued our taxi to the FBO on the centerline of the taxiway. After reaching the FBO; we noticed what appeared to be paint transfer on the left winglet which I believe came from the propeller of the first aircraft that required corrective action. This paint could be rubbed off and there were no dents or scratches. I realize that the taxiway centerline does not guarantee obstacle clearance and that it is the pilot's responsibility to see and avoid; however; it is my opinion that the clearance between Taxiway E and the north ramp is insufficient and hazardous. I believe that there should be a note on the airport diagram restricting the wingspan on Taxiway E or a caution that aircraft may be parked in close proximity to the taxiway.