Common Stock Issued and Outstanding (Tables)

12 Months Ended

Dec. 31, 2011

Activity in Number of Shares of Common Stock Issued and Outstanding

Activity in the number of shares of Common Stock issued and outstanding for the three years ended December 31, 2011 is shown below.

(Number of shares outstanding)	2011		2010		2009
At beginning of year		192,836,008		191,115,378		190,713,806
Stock options exercised		615,674		1,495,926		548,659
Employee stock purchase and thrift plans		33,390		49,657		61,575
Restricted stock awards, net of forfeitures		238,136		175,047		(208,662	)
At end of year		193,723,208		192,836,008		191,115,378