Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
3/29/2018	$41.03	$40.98	$41.01	44,774	$497,876,797
3/28/2018	$40.47	$40.45	$40.44	56,343	$491,427,434
3/27/2018	$40.46	$40.47	$40.47	48,442	$491,765,228
3/26/2018	$41.07	$41.08	$41.09	67,520	$501,205,511
3/23/2018	$40.06	$40.08	$40.08	64,072	$489,030,321
3/22/2018	$40.76	$40.72	$40.74	78,478	$496,842,828
3/21/2018	$41.74	$41.75	$41.75	79,995	$509,391,633
3/20/2018	$41.79	$41.79	$41.79	158,432	$511,881,727
3/19/2018	$41.83	$41.83	$41.83	54,072	$512,394,958
3/16/2018	$42.27	$42.29	$42.27	65,113	$518,036,816
3/15/2018	$42.09	$42.09	$42.09	88,452	$513,480,414
3/14/2018	$42.29	$42.28	$42.29	52,213	$515,831,086
3/13/2018	$42.47	$42.45	$42.46	40,631	$517,919,510
3/12/2018	$42.58	$42.53	$42.54	82,951	$518,888,334
3/9/2018	$42.59	$42.60	$42.60	22,275	$519,710,485
3/8/2018	$41.95	$41.93	$41.94	36,431	$511,605,382
3/7/2018	$42.00	$42.01	$42.01	16,189	$512,578,740
3/6/2018	$42.34	$42.40	$42.41	18,555	$517,338,211
3/5/2018	$41.96	$41.96	$41.97	119,177	$511,967,479
3/2/2018	$41.78	$41.78	$41.77	145,769	$513,897,469
3/1/2018	$41.50	$41.54	$41.53	158,702	$513,015,140