Closing Market Price and NAV History

Date	Market Price1	Net Asset Value2	Bid/Ask Midpoint	Volume1	Net Assets2
5/31/2013	$84.65	$84.20	$84.20	983,724	$437,796,850
5/30/2013	$86.50	$86.55	$86.45	839,619	$449,982,620
5/29/2013	$86.70	$86.85	$86.80	788,622	$451,544,985
5/28/2013	$86.90	$86.95	$87.00	954,739	$452,176,657
5/24/2013	$86.10	$86.15	$86.15	473,888	$449,798,883
5/23/2013	$86.35	$86.35	$86.40	895,304	$450,814,525
5/22/2013	$85.85	$85.65	$85.75	1,024,560	$447,149,622
5/21/2013	$87.40	$87.25	$87.25	592,896	$455,547,747
5/20/2013	$87.45	$87.55	$87.55	1,405,952	$446,417,984
5/17/2013	$85.35	$85.50	$85.45	1,151,608	$436,066,690
5/16/2013	$83.50	$83.45	$83.45	505,912	$425,683,374
5/15/2013	$84.55	$84.50	$84.45	465,808	$430,995,610
5/14/2013	$84.70	$84.80	$84.80	829,883	$432,530,644
5/13/2013	$83.25	$83.15	$83.20	396,084	$418,233,913
5/10/2013	$83.60	$83.75	$83.70	926,412	$421,239,902
5/9/2013	$82.60	$82.60	$82.65	892,178	$415,497,805
5/8/2013	$81.75	$81.70	$81.70	633,726	$415,089,472
5/7/2013	$81.75	$81.80	$81.80	417,445	$415,621,466
5/6/2013	$81.60	$81.65	$81.65	491,551	$414,842,994
5/3/2013	$81.15	$81.35	$81.25	1,082,571	$413,156,803
5/2/2013	$79.50	$79.60	$79.60	620,946	$404,279,738
5/1/2013	$79.15	$79.10	$79.15	1,014,545	$401,841,737