code: public Integer getPercent() {
  		Integer percent;
  		if (parent == null) {
  			percent = null;
  		} else {
  			percent = (int) (getTotal() * 100L / getParent().getTotal());
  		}
  		return percent;
  	}
docs: Returns the part of time spent in this node compared to parent.
  
  @return Percent time