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              [html]<thead><tr><td></td><td>2013</td><td>2012</td></tr></thead><tbody><tr><td>Weighted average fair value</td><td>$</td><td>9.68</td></tr><tr><td>$ 7.51</td><td>Risk - free interest rate</td><td>1.2 %</td></tr><tr><td>1.6 %</td><td>Dividend yield</td><td>3.4 %</td></tr><tr><td>4.0 %</td><td>Volatility of Class B Non - Voting shares</td><td>26.2 %</td></tr><tr><td>28.1 %</td><td>Weighted average expected life</td><td>n / a</td></tr><tr><td>5.4 years</td><td>Weighted average time to vest</td><td>2.4 years</td></tr><tr><td>2.4 years</td><td>Weighted average time to expiry</td><td>9.9 years</td></tr><tr><td>6.9 years</td><td>Employee exit rate</td><td>3.3 %</td></tr><tr><td>3.9 %</td><td>Suboptimal exercise factor</td><td>1.5</td></tr><tr><td>2.6</td><td>Lattice steps</td><td>50</td></tr></tbody>
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