Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
8/31/2017	$58.01	$57.75	$57.95	39,340	$571,814,227
8/30/2017	$57.63	$57.31	$57.55	28,422	$567,444,307
8/29/2017	$57.46	$57.04	$57.44	39,261	$564,837,251
8/28/2017	$57.74	$57.54	$57.70	112,938	$569,744,542
8/25/2017	$57.80	$57.53	$57.76	25,672	$569,680,399
8/24/2017	$57.35	$57.17	$57.41	39,623	$566,143,094
8/23/2017	$57.58	$57.34	$57.48	35,695	$562,053,220
8/22/2017	$57.56	$57.36	$57.44	41,828	$562,219,875
8/21/2017	$57.02	$56.95	$57.06	31,197	$558,203,530
8/18/2017	$56.97	$56.84	$56.93	63,726	$557,178,168
8/17/2017	$56.70	$56.70	$56.72	64,671	$555,797,073
8/16/2017	$57.39	$57.26	$57.43	67,909	$561,225,358
8/15/2017	$57.07	$56.81	$57.02	55,067	$556,883,679
8/14/2017	$57.09	$56.87	$57.08	25,772	$557,399,121
8/11/2017	$56.57	$56.71	$56.52	29,735	$555,860,317
8/10/2017	$56.70	$56.66	$56.65	39,388	$555,368,028
8/9/2017	$57.57	$57.38	$57.52	37,137	$556,721,419
8/8/2017	$57.81	$57.80	$57.79	99,700	$560,755,437
8/7/2017	$57.99	$57.84	$58.05	60,022	$546,742,245
8/4/2017	$57.81	$57.63	$57.83	161,791	$544,716,408
8/3/2017	$57.68	$57.64	$57.65	64,784	$544,798,755
8/2/2017	$57.85	$57.63	$57.81	73,965	$544,743,359
8/1/2017	$57.70	$57.60	$57.72	85,067	$544,418,298