Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
12/31/2019	$60.36	$60.37	$60.35	233,986	$3,392,569,789
12/30/2019	$60.33	$60.30	$60.31	374,034	$3,376,847,228
12/27/2019	$60.56	$60.57	$60.57	209,266	$3,392,183,480
12/26/2019	$60.55	$60.53	$60.54	96,620	$3,389,800,479
12/24/2019	$60.44	$60.42	$60.43	65,065	$3,380,678,522
12/23/2019	$60.45	$60.43	$60.43	218,632	$3,377,890,790
12/20/2019	$60.47	$60.44	$60.44	200,935	$3,378,496,942
12/19/2019	$60.08	$60.07	$60.07	210,806	$3,351,782,691
12/18/2019	$59.87	$59.83	$59.83	226,072	$3,338,322,628
12/17/2019	$59.89	$59.91	$59.91	262,639	$3,334,089,393
12/16/2019	$59.94	$59.92	$59.93	270,116	$3,334,624,571
12/13/2019	$59.65	$59.66	$59.67	368,899	$3,311,280,287
12/12/2019	$59.88	$59.86	$59.87	223,471	$3,316,333,409
12/11/2019	$59.43	$59.42	$59.42	155,917	$3,291,645,947
12/10/2019	$59.28	$59.26	$59.26	183,771	$3,279,931,033
12/9/2019	$59.36	$59.37	$59.37	253,940	$3,268,258,544
12/6/2019	$59.50	$59.51	$59.51	267,407	$3,275,802,817
12/5/2019	$59.12	$59.08	$59.10	269,205	$3,240,731,815
12/4/2019	$58.96	$58.96	$58.97	211,228	$3,234,031,541
12/3/2019	$58.65	$58.62	$58.63	261,800	$3,215,277,481
12/2/2019	$59.03	$58.98	$59.01	255,966	$3,226,357,005