Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
4/30/2014	$50.52	$50.53	$50.56	72,090	$790,729,388
4/29/2014	$50.23	$50.19	$50.21	39,964	$785,463,601
4/28/2014	$50.06	$50.01	$50.05	71,295	$777,664,821
4/25/2014	$50.27	$50.22	$50.27	67,743	$780,948,702
4/24/2014	$50.78	$50.78	$50.82	127,009	$789,553,922
4/23/2014	$50.81	$50.77	$50.77	76,446	$789,430,658
4/22/2014	$50.85	$50.81	$50.81	77,447	$790,034,719
4/21/2014	$50.43	$50.39	$50.42	175,922	$783,588,387
4/17/2014	$50.32	$50.28	$50.31	63,435	$781,789,777
4/16/2014	$50.26	$50.22	$50.25	37,575	$780,898,939
4/15/2014	$49.71	$49.69	$49.68	125,851	$772,685,453
4/14/2014	$49.35	$49.40	$49.38	108,341	$768,182,798
4/11/2014	$49.13	$49.11	$49.12	82,732	$763,720,631
4/10/2014	$49.80	$49.72	$49.73	65,267	$773,207,709
4/9/2014	$50.84	$50.79	$50.78	40,618	$789,757,369
4/8/2014	$50.31	$50.25	$50.28	89,273	$773,873,839
4/7/2014	$50.04	$49.97	$50.01	53,163	$769,489,530
4/4/2014	$51.00	$50.97	$51.02	73,371	$897,071,117
4/3/2014	$51.95	$51.90	$51.94	122,387	$799,254,623
4/2/2014	$52.17	$52.12	$52.16	78,774	$802,658,410
4/1/2014	$51.90	$51.89	$51.87	155,022	$799,132,442