Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
10/31/2018	$51.00	$50.99	$50.97	166,925	$1,121,851,708
10/30/2018	$50.66	$50.66	$50.66	111,548	$1,114,593,411
10/29/2018	$49.81	$49.78	$49.76	87,348	$1,095,115,813
10/26/2018	$49.52	$49.55	$49.49	118,203	$1,090,013,655
10/25/2018	$50.42	$50.38	$50.37	79,372	$1,108,343,317
10/24/2018	$49.96	$49.80	$49.82	167,673	$1,095,501,175
10/23/2018	$51.09	$51.11	$51.10	140,677	$1,124,324,913
10/22/2018	$51.34	$51.28	$51.29	40,495	$1,130,805,468
10/19/2018	$51.83	$51.77	$51.77	53,354	$1,141,577,878
10/18/2018	$51.70	$51.69	$51.71	102,810	$1,139,667,231
10/17/2018	$52.23	$52.24	$52.25	108,319	$1,146,631,983
10/16/2018	$52.26	$52.27	$52.30	105,583	$1,147,341,844
10/15/2018	$51.52	$51.48	$51.49	86,466	$1,130,059,975
10/12/2018	$51.41	$51.42	$51.41	216,212	$1,128,694,999
10/11/2018	$51.31	$51.29	$51.32	104,984	$1,125,715,376
10/10/2018	$52.53	$52.51	$52.52	138,095	$1,152,645,984
10/9/2018	$53.70	$53.66	$53.67	54,664	$1,177,852,610
10/8/2018	$54.17	$54.17	$54.20	37,336	$1,189,027,012
10/5/2018	$53.94	$53.87	$53.87	94,757	$1,182,493,998
10/4/2018	$54.21	$54.19	$54.22	227,386	$1,183,982,942
10/3/2018	$54.36	$54.33	$54.35	100,702	$1,187,139,053
10/2/2018	$54.23	$54.22	$54.25	60,962	$1,179,350,408
10/1/2018	$54.12	$54.12	$54.12	39,269	$1,177,047,221