A 58-year-old woman undergoes elective abdominal surgery for benign ovarian cyst removal. The surgical incision is closed with absorbable sutures. At 2 weeks post-operatively, the patient returns with a complaint of the incision 'not holding together well' and mild drainage. On examination, the wound shows dehiscence with separation of the fascial layers. Tensile strength testing of the wound at this stage would show approximately what percentage of normal skin tensile strength?