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
0.34	2011-11-04	8-K	2010	FY	2008-01-01	2008-12-31	CY2008
0.56	2012-02-29	10-K	2011	FY	2009-01-01	2009-12-31	CY2009
0.37	2013-02-28	10-K	2012	FY	2010-01-01	2010-12-31	CY2010
0.34	2014-02-20	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.35	2015-02-24	10-K	2014	FY	2012-01-01	2012-12-31	CY2012
0.28	2016-02-23	10-K	2015	FY	2013-01-01	2013-12-31	CY2013

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
0.34	2011-11-04	8-K	2010	FY	2008-01-01	2008-12-31	CY2008
0.34	2011-02-28	10-K	2010	FY	2008-01-01	2008-12-31
0.56	2011-11-04	8-K	2010	FY	2009-01-01	2009-12-31
0.56	2011-02-28	10-K	2010	FY	2009-01-01	2009-12-31
0.56	2012-02-29	10-K	2011	FY	2009-01-01	2009-12-31	CY2009
0.37	2011-11-04	8-K	2010	FY	2010-01-01	2010-12-31
0.37	2011-02-28	10-K	2010	FY	2010-01-01	2010-12-31
0.37	2013-02-28	10-K	2012	FY	2010-01-01	2010-12-31	CY2010
0.37	2012-02-29	10-K	2011	FY	2010-01-01	2010-12-31
0.34	2014-02-20	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.34	2013-02-28	10-K	2012	FY	2011-01-01	2011-12-31
0.34	2012-02-29	10-K	2011	FY	2011-01-01	2011-12-31
0.35	2015-02-24	10-K	2014	FY	2012-01-01	2012-12-31	CY2012
0.35	2014-02-20	10-K	2013	FY	2012-01-01	2012-12-31
0.35	2013-02-28	10-K	2012	FY	2012-01-01	2012-12-31
0.28	2016-02-23	10-K	2015	FY	2013-01-01	2013-12-31	CY2013
0.28	2015-02-24	10-K	2014	FY	2013-01-01	2013-12-31
0.28	2014-02-20	10-K	2013	FY	2013-01-01	2013-12-31