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Net Income per Share | 12 Months Ended
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Dec. 31, 2014
Net Income per Share | 3. Net Income per Share The following table sets forth the computation of basic and diluted net income per share attributable to ordinary shareholders:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Net income attributable to ordinary shareholders—basic and diluted |  |  | 22,826,454 |  |  |  | 51,435,171 |  |  |  | 72,406,504 |
Weighted average number of ordinary shares outstanding—basic |  |  | 27,751,335 |  |  |  | 27,480,150 |  |  |  | 27,873,501 |
Plus: share options |  |  | 249,756 |  |  |  | 229,339 |  |  |  | 178,203 |
Plus: non-vested restricted shares |  |  | 72,640 |  |  |  | 298,897 |  |  |  | 176,119 |
Weighted average number of ordinary shares outstanding—diluted |  |  | 28,073,731 |  |  |  | 28,008,386 |  |  |  | 28,227,823 |
Basic net income per share |  |  | 0.82 |  |  |  | 1.87 |  |  |  | 2.60 |
Diluted net income per share |  |  | 0.81 |  |  |  | 1.84 |  |  |  | 2.57 |
Diluted net income per share does not include the following instruments as their inclusion would be antidilutive:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Share options |  |  | 121,784 |  |  |  | 20,000 |  |  |  | 304,045 |
Restricted shares |  |  | 448,648 |  |  |  | 2,994 |  |  |  | — |
Total |  |  | 570,432 |  |  |  | 22,994 |  |  |  | 304,045 |

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