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December 31, 2011 

## August February August February February May February December February 2011 2011 2010 2010 2009 2008 2008 2007 2006 Expected volatility % 38.29 38.29 40.36 37.34 38.57 29.30 29.43 29.21  30.42 Risk-free rate % 1.42  1.42  1.22  1.16  1.02  0.96  0.96  0.95  0.95 Forfeiture rate % 1.87  1.87  1.87  1.87  1.87  1.87  1.87  1.87  1.87 Dividend yield %  2.45  2.45  2.45  2.45  2.45  2.45  2.45  2.45  2.45 January 1, 2011 August February February May February December February February 2010 2010 2009 2008 2008 2007 2006 2005 Expected volatility % 38.45 39.63 42.35 39.07 39.12 39.75 29.23 23.96 Risk-free rate % 2.51 2.45 2.21 1.94 1.9 1.86 1.67 1.68 Forfeiture rate % 1.87 1.87 1.87 1.87 1.87 1.87 1.87 1.87 Dividend yield % 2.09 2.09 2.09 2.09 2.09 2.09 2.09 2.09 

January 3, 2010 

## February May February December February February March February 2009 2008 2008 2007 2006 2005 2004 2004 Expected volatility %  43.69  43.69  43.69  43.69  43.69  50.31  29.89  29.89 Risk-free rate %  2.90  2.61  2.61  2.53  1.70  0.97  0.12  0.12 Forfeiture rate %  1.87  1.87  1.87  1.87  1.87  1.87  1.87  1.87 Dividend yield %  2.92  2.92  2.92  2.92  2.92  2.92  2.92  2.92 

The expected life of the share options and SARs is based on historical data and current expectations and is not necessarily indicative of exercise patterns that may occur. The expected volatility reflects the assumption that the historical volatility over a period similar to the life of the options is indicative of future trends, which may also not necessarily be the actual outcome. 

The following table illustrates the number (“No.”) and weighted average exercise prices (“WAEP”) of, and movements in, share options during the year: 

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