Grant Year | ||||||||
2013 | 2012 | 2011 | ||||||
Weighted-average dividend yield | 2.1 | % | 2.2 | % | 2.2 | % | ||
Weighted-average volatility | 30.6 | % | 35.0 | % | 32.7 | % | ||
Range of volatilities | 23.4-40.6% | 33.3-40.4% | 20.9-45.4% | |||||
Range of risk-free interest rates | 0.16-1.88% | 0.17-2.00% | 0.25-3.51% | |||||
Weighted-average expected lives | 8 years | 7 years | 8 years | |||||