Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
5/31/2013	$43.47	$43.22	$43.22	31,506	$440,846,901
5/30/2013	$43.63	$43.59	$43.63	34,553	$444,653,587
5/29/2013	$43.37	$43.31	$43.35	72,238	$441,766,188
5/28/2013	$43.57	$43.60	$43.60	27,858	$444,681,800
5/24/2013	$43.15	$43.20	$43.18	29,719	$440,615,942
5/23/2013	$43.31	$43.37	$43.38	127,097	$442,390,450
5/22/2013	$43.34	$43.31	$43.33	53,650	$441,775,657
5/21/2013	$44.02	$43.99	$44.00	30,068	$448,746,093
5/20/2013	$43.93	$43.92	$43.94	23,325	$448,015,168
5/17/2013	$43.88	$43.83	$43.86	38,885	$447,074,309
5/16/2013	$43.45	$43.38	$43.40	28,638	$442,449,330
5/15/2013	$43.67	$43.64	$43.65	63,219	$440,752,313
5/14/2013	$43.46	$43.41	$43.44	37,212	$438,473,178
5/13/2013	$42.97	$42.94	$42.95	43,893	$433,698,820
5/10/2013	$43.08	$43.08	$43.11	28,929	$435,128,802
5/9/2013	$42.80	$42.80	$42.82	27,712	$432,274,827
5/8/2013	$42.82	$42.86	$42.85	43,252	$432,885,255
5/7/2013	$42.80	$42.75	$42.75	30,128	$427,514,588
5/6/2013	$42.37	$42.33	$42.35	29,786	$423,302,787
5/3/2013	$42.16	$42.12	$42.14	46,943	$421,164,459
5/2/2013	$41.49	$41.48	$41.48	47,462	$414,765,695
5/1/2013	$41.11	$41.04	$41.05	76,417	$410,425,653