for the valuation of the 4199466 performance-based options granted in 2005 : the risk free interest rate was 4.2% ( 4.2 % ) , the volatility factor for the expected market price of the common stock was 44% ( 44 % ) , the expected dividend yield was zero and the objective time to exercise was 4.7 years with an objective in the money assumption of 2.95 years . it was also expected that the initial public offering assumption would occur within a 9 month period from grant date . the fair value of the performance-based options was calculated to be $ 5.85 . the fair value for fis options granted in 2006 was estimated at the date of grant using a black-scholes option- pricing model with the following weighted average assumptions . the risk free interest rates used in the calculation are the rate that corresponds to the weighted average expected life of an option . the risk free interest rate used for options granted during 2006 was 4.9% ( 4.9 % ) . a volatility factor for the expected market price of the common stock of 30% ( 30 % ) was used for options granted in 2006 . the expected dividend yield used for 2006 was 0.5% ( 0.5 % ) . a weighted average expected life of 6.4 years was used for 2006 . the weighted average fair value of each option granted during 2006 was $ 15.52 . at december 31 , 2006 , the total unrecognized compensation cost related to non-vested stock option grants is $ 86.1 million , which is expected to be recognized in pre-tax income over a weighted average period of 1.9 years . the company intends to limit dilution caused by option exercises , including anticipated exercises , by repurchasing shares on the open market or in privately negotiated transactions . during 2006 , the company repurchased 4261200 shares at an average price of $ 37.60 . on october 25 , 2006 , the company 2019s board of directors approved a plan authorizing the repurchase of up to an additional $ 200 million worth of the company 2019s common stock . defined benefit plans certegy pension plan in connection with the certegy merger , the company announced that it will terminate and settle the certegy u.s . retirement income plan ( usrip ) . the estimated impact of this settlement was reflected in the purchase price allocation as an increase in the pension liability , less the fair value of the pension plan assets , based on estimates of the total cost to settle the liability through the purchase of annuity contracts or lump sum settlements to the beneficiaries . the final settlement will not occur until after an irs determination has been obtained , which is expected to be received in 2007 . in addition to the net pension plan obligation of $ 21.6 million , the company assumed liabilities of $ 8.0 million for certegy 2019s supplemental executive retirement plan ( 201cserp 201d ) and $ 3.0 mil- lion for a postretirement benefit plan . a reconciliation of the changes in the fair value of plan assets of the usrip for the period from february 1 , 2006 through december 31 , 2006 is as follows ( in thousands ) : .
what is the percent increase in the fair value of plant asset after the acquisition date?
benefits paid in the above table include only those amounts paid directly from plan assets . as of december 31 , 2006 and for 2007 through the pay out of the pension liability , the assets are being invested in u.s . treasury bonds due to the short duration until final payment . fidelity national information services , inc . and subsidiaries and affiliates consolidated and combined financial statements notes to consolidated and combined financial statements 2014 ( continued ) .