The fair value of the Company's share options granted to employees, directors and consultants for the years ended December 31, 2017, 2016 and 2015 was estimated using the binomial model with the following assumptions:
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2017
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2016
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2015
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Dividend yield (%)
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-
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-
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-
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Expected volatility of the share prices (%)
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42-43
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45-54
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48-51
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Risk-free interest rate (%)
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1.89-2.42
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1.87-2.35
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1.8-2.7
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Suboptimal factor
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1.8-2
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1.8-2
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1.8-2
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Post-vesting forfeiture rate (%)
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5-10
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5-10
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5-10
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