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Earnings per share | 12 Months Ended
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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

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