25.  COMPENSATION, DEPRECIATION AND AMORTIZATION EXPENSES Had SENAO used the fair value method to evaluate the options using the Black-Scholes model, the assumptions of SENAO for  the year ended December 31, 2011 would have been as follows: PART III December 28,  2004 November 28,  2005 May 5,  2006 October 31,  2007 Expected dividend yield ─ ─ ─ 1.49% Risk free interest rate 1.88% 2.00% 1.75% 2.00% Expected life  4.375 years 4.375 years 4.375 years 4.375 years Expected volatility 49.88% 43.40% 39.63% 39.82% Weighted─average fair value of grants $4.91 $6.93 $5.88 $13.69 Year Ended December 31, 2009 Operating Operating Costs Expenses Total NT$ NT$ NT$ (In Millions) Compensation expense  Salaries  $  12,544 $  9,901 $  22,445 Insurance  999 771 1,770 Pension  1,517 1,138 2,655 Other compensation  8,807 6,031 14,838 $  23,867 $  17,841 $  41,708 Depreciation expense  $  33,169 $  1,945 $  35,114 Amortization expense  957 232 1,189 Year Ended December 31, 2010 Operating Operating Costs Expenses Total NT$ NT$ NT$ (In Millions) Compensation expense  Salaries  $  12,616 $  10,313 $  22,929 Insurance  1,053 828 1,881 Pension  1,705 1,203 2,908 Other compensation  9,652 6,705 16,357 $  25,026 $  19,049 $  44,075 Depreciation expense  $  30,972 $  1,765 $  32,737 Amortization expense  1,087 222 1,309 F-40