Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
1/30/2015	$51.31	$51.27	$51.31	81,376	$858,848,828
1/29/2015	$51.91	$51.88	$51.92	73,242	$868,980,394
1/28/2015	$51.53	$51.51	$51.53	75,439	$862,745,475
1/27/2015	$52.36	$52.32	$52.36	68,890	$876,436,299
1/26/2015	$52.61	$52.59	$52.64	52,672	$880,946,084
1/23/2015	$51.97	$51.94	$51.95	79,689	$869,977,705
1/22/2015	$52.28	$52.25	$52.28	144,455	$875,155,723
1/21/2015	$51.39	$51.33	$51.39	47,157	$859,706,973
1/20/2015	$50.95	$50.89	$50.94	89,176	$852,391,698
1/16/2015	$51.16	$51.11	$51.13	80,594	$856,062,261
1/15/2015	$50.33	$50.28	$50.31	73,770	$837,110,716
1/14/2015	$50.89	$50.91	$50.91	127,700	$847,652,275
1/13/2015	$51.17	$51.15	$51.20	92,150	$851,664,590
1/12/2015	$51.28	$51.29	$51.31	140,338	$853,983,785
1/9/2015	$51.80	$51.78	$51.79	113,683	$862,082,410
1/8/2015	$52.36	$52.32	$52.37	119,854	$871,189,224
1/7/2015	$51.55	$51.52	$51.59	104,038	$857,880,479
1/6/2015	$50.88	$50.89	$50.85	95,525	$847,299,663
1/5/2015	$51.64	$51.61	$51.59	81,597	$859,244,464
1/2/2015	$52.59	$52.56	$52.52	96,375	$875,109,086