[["", "2014", "2013", "2012"], ["expected term ( in years ) ( 1 )", "4.80", "6.08", "6.02"], ["risk-free rate of return ( 2 )", "1.3% ( 1.3 % )", "0.8% ( 0.8 % )", "1.2% ( 1.2 % )"], ["expected volatility ( 3 )", "25.2% ( 25.2 % )", "29.3% ( 29.3 % )", "34.9% ( 34.9 % )"], ["expected dividend yield ( 4 )", "0.8% ( 0.8 % )", "0.9% ( 0.9 % )", "0.9% ( 0.9 % )"], ["fair value per option granted", "$ 44.11", "$ 39.03", "$ 29.65"]]