Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
9/30/2015	$48.09	$48.09	$48.09	55,897	$844,058,039
9/29/2015	$47.45	$47.45	$47.43	191,506	$832,716,207
9/28/2015	$47.52	$47.51	$47.49	64,658	$833,790,986
9/25/2015	$48.79	$48.80	$48.79	29,220	$856,419,214
9/24/2015	$48.92	$48.88	$48.89	27,636	$857,801,838
9/23/2015	$49.03	$49.02	$49.03	63,363	$860,312,801
9/22/2015	$49.38	$49.39	$49.38	41,094	$866,737,469
9/21/2015	$50.07	$50.11	$50.11	44,512	$879,382,948
9/18/2015	$49.88	$49.89	$49.88	58,799	$875,598,893
9/17/2015	$50.79	$50.83	$50.82	52,679	$892,037,830
9/16/2015	$50.89	$50.87	$50.91	48,136	$892,766,696
9/15/2015	$50.29	$50.28	$50.30	36,989	$882,425,997
9/14/2015	$49.66	$49.67	$49.66	64,741	$871,782,869
9/11/2015	$49.97	$49.96	$49.99	52,554	$876,797,158
9/10/2015	$49.82	$49.81	$49.84	44,135	$874,163,790
9/9/2015	$49.68	$49.70	$49.71	62,503	$872,288,378
9/8/2015	$50.31	$50.29	$50.28	70,572	$882,548,898
9/4/2015	$49.06	$49.04	$49.03	184,139	$858,139,291
9/3/2015	$49.61	$49.62	$49.61	66,372	$870,917,956
9/2/2015	$49.33	$49.36	$49.37	112,331	$866,333,157
9/1/2015	$48.73	$48.71	$48.71	258,810	$854,843,991