private void initList(){
		listModel = new DefaultListModel();

		for (int i=0;i<checkedOutBooksInYear.size();i++){
			Borrowing b = checkedOutBooksInYear.get(i);
			BorrowingFrequency bfr = new BorrowingFrequency(b.getCallNumber(), countUniqueItems(b.getCallNumber()));
			bf.add(bfr);


		}



		int count = 0;
		for (int i = 0; i < checkedOutBooksInYear.size(); i++) {
			int index;

			index = topN();
			if (index != -1) {
				BorrowingFrequency b = bf.get(index);
				String msg = "CallNumber " + b.getCallNumber() + " Borrowed " + b.getFrequency() + " times this year";
				if (!listModel.contains(msg) && count < number) {
					listModel.addElement(msg);
					count = count + 1;
				}
				bf.remove(index);
			}
		}



	}