Securities and Exchange Commission

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

Compare To Other Companies

Annual (pure)

Value	Reported On	Form	FY	FP	Start Date	End Date	Fiscal Period
0.205	2011-08-09	8-K	2010	FY	2008-01-01	2008-12-31	CY2008
0.294	2012-11-07	8-K	2011	Q4	2009-01-01	2009-12-31	CY2009
0.3408	2013-11-05	8-K	2012	Q4	2010-01-01	2010-12-31	CY2010
0.348	2014-02-21	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.3515	2014-02-21	10-K	2013	FY	2012-01-01	2012-12-31	CY2012

Quarterly (pure)

Value	Reported On	Form	FY	FP	Start Date	End Date	Fiscal Period
0.3408	2011-05-10	10-Q	2011	Q1	2010-01-01	2010-03-31	CY2010Q1
0.348	2011-05-10	10-Q	2011	Q1	2011-01-01	2011-03-31	CY2011Q1

All Reported Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate (pure)

Value	Reported On	Form	FY	FP	Start Date	End Date	Fiscal Period
0.205	2011-08-09	8-K	2010	FY	2008-01-01	2008-12-31	CY2008
0.205	2011-05-10	8-K	2010	FY	2008-01-01	2008-12-31
0.205	2011-03-24	10-K/A	2010	FY	2008-01-01	2008-12-31
0.294	2012-02-17	10-K	2011	FY	2009-01-01	2009-12-31
0.294	2011-08-09	8-K	2010	FY	2009-01-01	2009-12-31
0.294	2011-05-10	8-K	2010	FY	2009-01-01	2009-12-31
0.294	2011-03-24	10-K/A	2010	FY	2009-01-01	2009-12-31
0.294	2012-11-07	8-K	2011	Q4	2009-01-01	2009-12-31	CY2009
0.294	2012-08-06	8-K	2011	Q4	2009-01-01	2009-12-31
0.294	2012-05-10	8-K	2011	Q4	2009-01-01	2009-12-31
0.3408	2011-05-10	10-Q	2011	Q1	2010-01-01	2010-03-31	CY2010Q1
0.3408	2011-08-09	10-Q	2011	Q2	2010-01-01	2010-06-30
0.3408	2012-02-17	10-K	2011	FY	2010-01-01	2010-12-31
0.3408	2011-08-09	8-K	2010	FY	2010-01-01	2010-12-31
0.3408	2011-05-10	8-K	2010	FY	2010-01-01	2010-12-31
0.3408	2011-03-24	10-K/A	2010	FY	2010-01-01	2010-12-31
0.3408	2013-11-05	8-K	2012	Q4	2010-01-01	2010-12-31	CY2010
0.3408	2013-08-06	8-K	2012	Q4	2010-01-01	2010-12-31
0.3408	2013-05-07	8-K	2012	Q4	2010-01-01	2010-12-31
0.3408	2013-02-26	10-K	2012	FY	2010-01-01	2010-12-31
0.3408	2012-11-07	8-K	2011	Q4	2010-01-01	2010-12-31
0.3408	2012-08-06	8-K	2011	Q4	2010-01-01	2010-12-31
0.3408	2012-05-10	8-K	2011	Q4	2010-01-01	2010-12-31
0.348	2011-05-10	10-Q	2011	Q1	2011-01-01	2011-03-31	CY2011Q1
0.348	2011-08-09	10-Q	2011	Q2	2011-01-01	2011-06-30
0.348	2012-02-17	10-K	2011	FY	2011-01-01	2011-12-31
0.348	2014-02-21	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.348	2013-11-05	8-K	2012	Q4	2011-01-01	2011-12-31
0.348	2013-08-06	8-K	2012	Q4	2011-01-01	2011-12-31
0.348	2013-05-07	8-K	2012	Q4	2011-01-01	2011-12-31
0.348	2013-02-26	10-K	2012	FY	2011-01-01	2011-12-31
0.348	2012-11-07	8-K	2011	Q4	2011-01-01	2011-12-31
0.348	2012-08-06	8-K	2011	Q4	2011-01-01	2011-12-31
0.348	2012-05-10	8-K	2011	Q4	2011-01-01	2011-12-31
0.3515	2014-02-21	10-K	2013	FY	2012-01-01	2012-12-31	CY2012
0.3515	2013-11-05	8-K	2012	Q4	2012-01-01	2012-12-31
0.3515	2013-08-06	8-K	2012	Q4	2012-01-01	2012-12-31
0.3515	2013-05-07	8-K	2012	Q4	2012-01-01	2012-12-31
0.3515	2013-02-26	10-K	2012	FY	2012-01-01	2012-12-31