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              [html]<thead><tr><td>Fiscal year</td><td>2014</td><td>2013</td><td>2012</td></tr></thead><tbody><tr><td>Risk - free interest rate : Represents the yield on U. S. Treasury zano - coupon securities that mature over the 10 - year life of the stook options.</td><td>0.2 % – 2.6 %</td><td>0.2 % – 1.8 %</td><td>0.3 % – 2.0 %</td></tr><tr><td>Weighted - overage volatility : Based on a combination of the historical volatility of our common stock and the implied volatility of exchange - traded options for our common stock.</td><td>30.1 %</td><td>31.8 %</td><td>36.5 %</td></tr><tr><td>Weighted - average expected dividend yield : Our forecasted dividend yield for the next 10 years.</td><td>2.2 %</td><td>2.0 %</td><td>2.1 %</td></tr><tr><td>Expected life in years. Responsents the excitrated percept of time until ; estimate carcitan. The wespected berm of options granted was derived from the output of the Binomial Latitoe option validation model and was based on our historio</td><td>6.8</td><td>6.7</td><td>6.1</td></tr></tbody>
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