Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
3/29/2018	$52.71	$52.71	$52.75	96,367	$1,054,205,642
3/28/2018	$52.09	$52.07	$52.10	56,496	$1,041,413,372
3/27/2018	$52.18	$52.12	$52.15	63,980	$1,042,376,770
3/26/2018	$52.58	$52.56	$52.57	74,923	$1,048,578,520
3/23/2018	$51.51	$51.45	$51.52	38,307	$1,026,526,965
3/22/2018	$52.41	$52.39	$52.44	44,815	$1,045,120,209
3/21/2018	$53.52	$53.70	$53.74	42,047	$1,071,314,662
3/20/2018	$53.65	$53.62	$53.66	22,176	$1,069,624,535
3/19/2018	$53.71	$53.66	$53.72	42,645	$1,070,602,940
3/16/2018	$54.24	$54.26	$54.27	46,675	$1,082,546,130
3/15/2018	$54.02	$53.99	$54.00	69,204	$1,077,110,025
3/14/2018	$54.16	$54.17	$54.22	39,129	$1,080,655,213
3/13/2018	$54.55	$54.52	$54.55	61,489	$1,087,718,421
3/12/2018	$54.65	$54.63	$54.65	37,545	$1,089,937,119
3/9/2018	$54.65	$54.70	$54.72	43,546	$1,091,316,713
3/8/2018	$54.00	$54.00	$53.96	49,426	$1,077,297,612
3/7/2018	$53.84	$53.87	$53.89	55,400	$1,074,635,436
3/6/2018	$54.07	$54.10	$54.07	190,661	$1,079,368,969
3/5/2018	$54.00	$53.97	$53.95	61,167	$1,082,046,310
3/2/2018	$53.37	$53.34	$53.36	65,878	$1,069,553,772
3/1/2018	$53.10	$53.08	$53.10	99,191	$1,061,624,108