(9)   Earnings Per Share

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The share and net income per share data for all periods presented are based on the historical weighted-average shares outstanding. The diluted earnings per share calculations show the effect of the weighted-average restricted stock units outstanding from our equity incentive plans. Performance stock units are not included in the diluted earnings per share calculation until the performance-based criteria have been met.

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For all periods presented, the weighted-average shares of nonvested stock units that were outstanding but not included in the computation of diluted earnings per share because they would have had an anti-dilutive effect were not significant.

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The following table sets forth the calculation of earnings per share and weighted-average shares outstanding as presented in the accompanying unaudited condensed consolidated statements of income and comprehensive income:

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