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
0.7071	2013-02-27	10-K	2012	FY	2010-01-01	2010-12-31	CY2010
0.6071	2014-03-03	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.6276	2015-02-27	10-K	2014	FY	2012-01-01	2012-12-31	CY2012
0.6083	2016-02-24	10-K	2015	FY	2013-01-01	2013-12-31	CY2013
0.5756	2017-03-01	10-K	2016	FY	2014-01-01	2014-12-31	CY2014
0.4927	2017-03-01	10-K	2016	FY	2015-01-01	2015-12-31	CY2015
0.44	2017-03-01	10-K	2016	FY	2016-01-01	2016-12-31	CY2016

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
0.7071	2013-02-27	10-K	2012	FY	2010-01-01	2010-12-31	CY2010
0.6071	2013-02-27	10-K	2012	FY	2011-01-01	2011-12-31
0.6071	2014-03-03	10-K	2013	FY	2011-01-01	2011-12-31	CY2011
0.6276	2013-02-27	10-K	2012	FY	2012-01-01	2012-12-31
0.6276	2014-03-03	10-K	2013	FY	2012-01-01	2012-12-31
0.6276	2015-02-27	10-K	2014	FY	2012-01-01	2012-12-31	CY2012
0.6083	2014-03-03	10-K	2013	FY	2013-01-01	2013-12-31
0.6083	2015-02-27	10-K	2014	FY	2013-01-01	2013-12-31
0.6083	2016-02-24	10-K	2015	FY	2013-01-01	2013-12-31	CY2013
0.5756	2015-02-27	10-K	2014	FY	2014-01-01	2014-12-31
0.5756	2016-02-24	10-K	2015	FY	2014-01-01	2014-12-31
0.5756	2017-03-01	10-K	2016	FY	2014-01-01	2014-12-31	CY2014
0.4927	2016-02-24	10-K	2015	FY	2015-01-01	2015-12-31
0.4927	2017-03-01	10-K	2016	FY	2015-01-01	2015-12-31	CY2015
0.44	2017-03-01	10-K	2016	FY	2016-01-01	2016-12-31	CY2016