Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
3/29/2018	$62.84	$62.57	$62.60	67,746	$1,167,091,718
3/28/2018	$61.88	$61.51	$61.73	67,692	$1,147,339,973
3/27/2018	$61.92	$61.77	$61.79	80,516	$1,152,111,101
3/26/2018	$62.38	$62.37	$62.28	64,973	$1,163,336,374
3/23/2018	$61.25	$61.15	$61.31	86,691	$1,140,506,657
3/22/2018	$62.40	$62.26	$62.38	95,472	$1,161,360,892
3/21/2018	$63.61	$63.67	$63.76	71,823	$1,187,556,348
3/20/2018	$63.56	$63.32	$63.55	87,257	$1,165,305,498
3/19/2018	$63.30	$63.13	$63.31	102,829	$1,161,721,839
3/16/2018	$63.74	$63.75	$63.87	67,657	$1,173,129,169
3/15/2018	$63.95	$63.83	$63.98	90,687	$1,174,530,429
3/14/2018	$63.79	$63.71	$63.84	154,311	$1,159,595,289
3/13/2018	$63.56	$63.44	$63.56	262,089	$1,154,808,265
3/12/2018	$63.96	$63.86	$63.97	82,300	$1,152,719,021
3/9/2018	$63.81	$63.66	$63.66	81,082	$1,149,189,581
3/8/2018	$63.21	$62.90	$63.20	81,046	$1,135,473,565
3/7/2018	$63.01	$62.89	$62.94	91,255	$1,119,588,632
3/6/2018	$63.22	$62.73	$63.15	138,599	$1,116,782,490
3/5/2018	$62.57	$62.39	$62.45	88,978	$1,070,119,641
3/2/2018	$62.65	$62.21	$62.53	811,457	$1,066,950,685
3/1/2018	$62.30	$62.25	$62.21	185,567	$1,055,239,481