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Earnings per share
 12 Months Ended
Dec. 31, 2011
Earnings per share

15. Earnings per share

 

Earnings per share (“EPS”) are computed on a basic and diluted basis. Basic EPS is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. The computation of diluted EPS assumes the issuance of common shares for all potential common shares outstanding during the reporting period and, if dilutive, the effect of stock options using the treasury stock method.

 

The following summarizes information related to the computation of basic and diluted EPS for the respective years ended December 31:

 

    2011     2010     2009  
Net income attributable to Consolidated Water Co. Ltd. common stockholders   $ 6,113,218     $ 6,292,025     $ 6,098,571  
Less: Dividends paid and earnings attributable on preferred stock     (7,040 )     (5,350 )     (5,236 )
Net income available to common shares in the determination of basic earnings per common share   $ 6,106,178     $ 6,286,675     $ 6,093,335  
                         
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,560,259       14,547,065       14,535,192  
Plus:                        
Weighted average number of preferred shares outstanding during the year     19,892       18,723       17,657  
Potential dilutive effect of unexercised options     15,862       32,106       35,295  
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders     14,596,013       14,597,894       14,588,144