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Earnings per share (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Net income attributable to Consolidated Water Co. Ltd. common stockholders | $ 2,853,850 | $ 1,957,492 | $ 6,595,853 | $ 4,300,158
Less: preferred stock dividends | (2,996) | (2,421) | (5,991) | (4,842)
Net income available to common shares in the determination of basic earnings per common share | $ 2,850,854 | $ 1,955,071 | $ 6,589,862 | $ 4,295,316
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 14,636,916 | 14,579,496 | 14,617,613 | 14,574,689
Plus: Weighted average number of preferred shares outstanding during the period | 31,998 | 24,082 | 30,944 | 23,187
Potential dilutive effect of unexercised options | 15,601 | 274 | 11,036 | 178
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) | 14,684,515 | 14,603,852 | 14,659,593 | 14,598,054

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