notes to the consolidated financial statements related to the change in the unrealized gain ( loss ) on derivatives for the years ended december 31 , 2010 , 2009 and 2008 was $ 1 million , $ ( 16 ) million and $ 30 million , respectively . 19 . employee savings plan ppg 2019s employee savings plan ( 201csavings plan 201d ) covers substantially all u.s . employees . the company makes matching contributions to the savings plan based upon participants 2019 savings , subject to certain limitations . for most participants not covered by a collective bargaining agreement , company-matching contributions are established each year at the discretion of the company and are applied to a maximum of 6% ( 6 % ) of eligible participant compensation . for those participants whose employment is covered by a collective bargaining agreement , the level of company- matching contribution , if any , is determined by the collective bargaining agreement . the company-matching contribution was 100% ( 100 % ) for 2008 and for the first two months of 2009 . the company- matching contribution was suspended from march 2009 through june 2010 as a cost savings measure in recognition of the adverse impact of the global recession . effective july 1 , 2010 , the company match was reinstated at 50% ( 50 % ) on the first 6% ( 6 % ) contributed for most employees eligible for the company-matching contribution feature . this would have included the bargained employees in accordance with their collective bargaining agreements . on january 1 , 2011 , the company match was increased to 75% ( 75 % ) on the first 6% ( 6 % ) contributed by these eligible employees . compensation expense and cash contributions related to the company match of participant contributions to the savings plan for 2010 , 2009 and 2008 totaled $ 9 million , $ 7 million and $ 42 million , respectively . a portion of the savings plan qualifies under the internal revenue code as an employee stock ownership plan . as a result , the tax deductible dividends on ppg shares held by the savings plan were $ 24 million , $ 28 million and $ 29 million for 2010 , 2009 and 2008 , respectively . 20 . other earnings ( millions ) 2010 2009 2008 .
interest income is what percent of other income for 2010?\\n\\n
total $ 214 $ 178 $ 165 21 . stock-based compensation the company 2019s stock-based compensation includes stock options , restricted stock units ( 201crsus 201d ) and grants of contingent shares that are earned based on achieving targeted levels of total shareholder return . all current grants of stock options , rsus and contingent shares are made under the ppg industries , inc . omnibus incentive plan ( 201cppg omnibus plan 201d ) . shares available for future grants under the ppg omnibus plan were 4.1 million as of december 31 , 2010 . total stock-based compensation cost was $ 52 million , $ 34 million and $ 33 million in 2010 , 2009 and 2008 , respectively . the total income tax benefit recognized in the accompanying consolidated statement of income related to the stock-based compensation was $ 18 million , $ 12 million and $ 12 million in 2010 , 2009 and 2008 , respectively . stock options ppg has outstanding stock option awards that have been granted under two stock option plans : the ppg industries , inc . stock plan ( 201cppg stock plan 201d ) and the ppg omnibus plan . under the ppg omnibus plan and the ppg stock plan , certain employees of the company have been granted options to purchase shares of common stock at prices equal to the fair market value of the shares on the date the options were granted . the options are generally exercisable beginning from six to 48 months after being granted and have a maximum term of 10 years . upon exercise of a stock option , shares of company stock are issued from treasury stock . the ppg stock plan includes a restored option provision for options originally granted prior to january 1 , 2003 that allows an optionee to exercise options and satisfy the option price by certifying ownership of mature shares of ppg common stock with equivalent market value . the fair value of stock options issued to employees is measured on the date of grant and is recognized as expense over the requisite service period . ppg estimates the fair value of stock options using the black-scholes option pricing model . the risk-free interest rate is determined by using the u.s . treasury yield curve at the date of the grant and using a maturity equal to the expected life of the option . the expected life of options is calculated using the average of the vesting term and the maximum term , as prescribed by accounting guidance on the use of the simplified method for determining the expected term of an employee share option . this method is used as the vesting term of stock options was changed to three years in 2004 and , as a result , the historical exercise data does not provide a reasonable basis upon which to estimate the expected life of options . the expected dividend yield and volatility are based on historical stock prices and dividend amounts over past time periods equal in length to the expected life of the options . 66 2010 ppg annual report and form 10-k .