8Earnings per share
Basic earnings per share is calculated by dividing the earnings attributable to ordinary shareholders by the weighted average number of ordinary shares in issue during the year, excluding those held as treasury stock which are treated as cancelled.
For diluted earnings per share, the weighted average number of ordinary shares in issue is adjusted to assume conversion of all dilutive potential ordinary shares. The Company had two categories of dilutive potential ordinary shares during the year: those being share options granted to employees and directors where the exercise price is less than the average market price of the Company’s ordinary shares during the year and the awards made under the Company’s Restricted Stock Unit (RSU), Deferred Annual Bonus Plan (DAB) and Long Term Incentive Plan (LTIP) schemes. For 2010 and 2009 no shares that were allocated for awards under the LTIP were included in the diluted EPS calculation as the performance criteria could not be measured until the conclusion of the performance period.
Reconciliations of the earnings and weighted average number of shares used in the calculations are shown on the face of the income statement.