Financial report context:
material impact on the service cost and interest cost components of net periodic benefit costs for a 1% ( 1 % ) change in the assumed health care trend rate . for most of the participants in the u.s . plan , aon 2019s liability for future plan cost increases for pre-65 and medical supplement plan coverage is limited to 5% ( 5 % ) per annum . because of this cap , net employer trend rates for these plans are effectively limited to 5% ( 5 % ) per year in the future . during 2007 , aon recognized a plan amendment which phases out post-65 retiree coverage in its u.s . plan over the next three years . the impact of this amendment on net periodic benefit cost is being recognized over the average remaining service life of the employees . 14 . stock compensation plans the following table summarizes stock-based compensation expense recognized in continuing operations in the consolidated statements of income in compensation and benefits ( in millions ) : .

Financial table:
years ended december 31: rsus; 2010: $ 138; 2009: $ 124; 2008: $ 132
years ended december 31: performance plans; 2010: 62; 2009: 60; 2008: 67
years ended december 31: stock options; 2010: 17; 2009: 21; 2008: 24
years ended december 31: employee stock purchase plans; 2010: 4; 2009: 4; 2008: 3
years ended december 31: total stock-based compensation expense; 2010: 221; 2009: 209; 2008: 226
years ended december 31: tax benefit; 2010: 75; 2009: 68; 2008: 82
years ended december 31: stock-based compensation expense net of tax; 2010: $ 146; 2009: $ 141; 2008: $ 144

Additional report context:
during 2009 , the company converted its stock administration system to a new service provider . in connection with this conversion , a reconciliation of the methodologies and estimates utilized was performed , which resulted in a $ 12 million reduction of expense for the year ended december 31 , 2009 . stock awards stock awards , in the form of rsus , are granted to certain employees and consist of both performance-based and service-based rsus . service-based awards generally vest between three and ten years from the date of grant . the fair value of service-based awards is based upon the market value of the underlying common stock at the date of grant . with certain limited exceptions , any break in continuous employment will cause the forfeiture of all unvested awards . compensation expense associated with stock awards is recognized over the service period . dividend equivalents are paid on certain service-based rsus , based on the initial grant amount . performance-based rsus have been granted to certain employees . vesting of these awards is contingent upon meeting various individual , divisional or company-wide performance conditions , including revenue generation or growth in revenue , pretax income or earnings per share over a one- to five-year period . the performance conditions are not considered in the determination of the grant date fair value for these awards . the fair value of performance-based awards is based upon the market price of the underlying common stock at the date of grant . compensation expense is recognized over the performance period , and in certain cases an additional vesting period , based on management 2019s estimate of the number of units expected to vest . compensation expense is adjusted to reflect the actual number of shares paid out at the end of the programs . the actual payout of shares under these performance- based plans may range from 0-200% ( 0-200 % ) of the number of units granted , based on the plan . dividend equivalents are generally not paid on the performance-based rsus . during 2010 , the company granted approximately 1.6 million shares in connection with the completion of the 2007 leadership performance plan ( 2018 2018lpp 2019 2019 ) cycle and 84000 shares related to other performance plans . during 2010 , 2009 and 2008 , the company granted approximately 3.5 million .

Question: what was the percentage change in the expenses related to he issuing of stock option in 2009
Answer: 5.7%