Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
5/31/2013	$38.51	$38.27	$38.30	14,819	$78,444,241
5/30/2013	$38.75	$38.73	$38.75	14,465	$79,393,220
5/29/2013	$38.52	$38.45	$38.50	16,157	$78,825,009
5/28/2013	$38.74	$38.64	$38.68	7,383	$79,220,126
5/24/2013	$38.34	$38.31	$38.34	4,316	$78,538,574
5/23/2013	$38.38	$38.40	$38.43	1,721	$78,714,565
5/22/2013	$38.35	$38.38	$38.42	11,428	$78,686,911
5/21/2013	$38.94	$38.93	$38.97	18,373	$79,811,525
5/20/2013	$38.85	$38.87	$38.88	47,617	$79,679,169
5/17/2013	$38.73	$38.69	$38.72	15,309	$79,314,517
5/16/2013	$38.25	$38.20	$38.24	8,967	$78,306,902
5/15/2013	$38.43	$38.37	$38.39	11,402	$78,654,318
5/14/2013	$38.24	$38.19	$38.24	13,241	$78,293,162
5/13/2013	$37.77	$37.73	$37.76	18,996	$73,578,693
5/10/2013	$37.92	$37.88	$37.89	9,074	$73,860,478
5/9/2013	$37.64	$37.65	$37.68	16,555	$73,409,807
5/8/2013	$37.82	$37.77	$37.80	18,394	$73,646,835
5/7/2013	$37.57	$37.59	$37.61	15,617	$73,296,909
5/6/2013	$37.29	$37.28	$37.32	8,448	$72,687,082
5/3/2013	$37.20	$37.15	$37.17	9,455	$72,448,055
5/2/2013	$36.68	$36.61	$36.63	6,888	$71,394,184
5/1/2013	$36.25	$36.25	$36.30	10,034	$70,680,292