Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
12/31/2014	$52.87	$52.79	$52.82	46,159	$876,370,516
12/30/2014	$53.41	$53.34	$53.33	77,202	$885,430,518
12/29/2014	$53.72	$53.71	$53.75	40,502	$891,511,450
12/26/2014	$53.33	$53.35	$53.39	53,874	$885,498,331
12/24/2014	$53.22	$53.16	$53.20	40,791	$877,166,351
12/23/2014	$53.10	$53.06	$53.09	133,486	$880,856,681
12/22/2014	$53.00	$52.97	$52.97	60,406	$879,235,331
12/19/2014	$52.84	$52.81	$52.87	87,426	$876,696,000
12/18/2014	$52.59	$52.55	$52.60	76,948	$864,477,407
12/17/2014	$51.65	$51.67	$51.70	175,391	$849,911,289
12/16/2014	$50.56	$50.49	$50.48	174,698	$830,626,276
12/15/2014	$50.70	$50.65	$50.68	89,746	$833,249,918
12/12/2014	$51.01	$50.98	$50.96	57,097	$838,583,818
12/11/2014	$51.78	$51.72	$51.77	81,009	$845,699,228
12/10/2014	$51.43	$51.45	$51.44	88,907	$841,233,719
12/9/2014	$52.56	$52.51	$52.52	89,917	$858,588,491
12/8/2014	$52.23	$52.23	$52.21	71,810	$853,891,163
12/5/2014	$52.66	$52.66	$52.65	42,319	$860,928,687
12/4/2014	$52.61	$52.55	$52.57	91,801	$859,160,409
12/3/2014	$52.79	$52.76	$52.76	50,385	$862,595,123
12/2/2014	$52.31	$52.26	$52.29	108,205	$854,425,242
12/1/2014	$51.95	$51.96	$51.95	46,790	$849,515,004