Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
10/31/2017	$60.52	$60.19	$60.46	59,175	$698,362,690
10/30/2017	$60.15	$60.12	$60.08	87,876	$697,559,869
10/27/2017	$60.06	$59.85	$60.07	30,384	$694,341,624
10/26/2017	$59.98	$59.78	$59.92	61,564	$693,581,579
10/25/2017	$60.06	$59.96	$59.89	73,249	$695,602,976
10/24/2017	$60.23	$60.01	$60.18	35,939	$696,201,523
10/23/2017	$60.04	$60.05	$59.99	43,463	$696,736,407
10/20/2017	$60.06	$59.88	$60.03	35,639	$694,703,842
10/19/2017	$59.96	$59.89	$59.94	71,662	$670,837,641
10/18/2017	$60.33	$60.09	$60.24	36,362	$673,160,537
10/17/2017	$60.27	$60.10	$60.18	38,271	$673,295,760
10/16/2017	$60.45	$60.26	$60.47	63,985	$674,996,110
10/13/2017	$60.51	$60.21	$60.43	79,631	$674,474,806
10/12/2017	$60.05	$59.91	$60.03	57,396	$671,083,570
10/11/2017	$60.09	$59.79	$60.04	147,548	$855,086,311
10/10/2017	$59.92	$59.73	$59.87	106,827	$669,099,765
10/9/2017	$59.28	$59.17	$59.29	32,926	$662,786,410
10/6/2017	$59.42	$59.09	$59.34	28,085	$653,080,299
10/5/2017	$59.49	$59.05	$59.43	38,173	$652,592,382
10/4/2017	$59.37	$59.18	$59.40	191,590	$654,048,987
10/3/2017	$59.49	$59.16	$59.43	71,880	$653,828,267
10/2/2017	$59.07	$58.84	$59.05	101,491	$650,253,851