. options to purchase 493544 shares , 23000 shares and 612892 shares of snap-on common stock for the fiscal years ended 2007 , 2006 and 2005 , respectively , were not included in the computation of diluted earnings per share as the exercise prices of the options were greater than the average market price of the common stock for the respective year and , as a result , the effect on earnings per share would be anti-dilutive . stock-based compensation : effective january 1 , 2006 , the company adopted sfas no