The fair value of the options granted in 2014, as part of 2014 equity compensation plan, was estimated using the binomial model for pricing options. The grants in 2015 and 2016 and 2017 under the 2014 Equity Compensation Plan were estimated using the Black & Scholes model for pricing options. The parameters used in applying the models are as follows:
| 2014 Plan | |||
| Granted 2014 | Granted 2015 | Granted 2016 | Granted 2017 |