defined by fin 46 ( r ) , as a result of the issuance of subordinated notes by the conduits to third-party investors , and we do not record these conduits in our consolidated financial statements . at december 31 , 2006 and 2005 , total assets in unconsolidated conduits were $ 25.25 billion and $ 17.90 billion , respectively . our off-balance sheet commitments to these conduits are disclosed in note 10 . collateralized debt obligations : we manage a series of collateralized debt obligations , or 201ccdos . 201d a cdo is a managed investment vehicle which purchases a portfolio of diversified highly-rated assets . a cdo funds purchases through the issuance of several tranches of debt and equity , the repayment and return of which are linked to the performance of the assets in the cdo . typically , our involvement is as collateral manager . we may also invest in a small percentage of the debt issued . these entities typically meet the definition of a variable interest entity as defined by fin 46 ( r ) . we are not the primary beneficiary of these cdos , as defined by fin 46 ( r ) , and do not record these cdos in our consolidated financial statements . at december 31 , 2006 and 2005 , total assets in these cdos were $ 3.48 billion and $ 2.73 billion , respectively . during 2005 , we acquired and transferred $ 60 million of investment securities from our available-for- sale portfolio into a cdo . this transfer , which was executed at fair market value in exchange for cash , was treated as a sale . we did not acquire or transfer any investment securities to a cdo during 2006 . note 12 . shareholders 2019 equity treasury stock : during the first quarter of 2006 , we purchased 3 million shares of our common stock under a program authorized by our board of directors , or 201cboard , 201d in 2005 . on march 16 , 2006 , the board authorized a new program for the purchase of up to 15 million shares of our common stock for general corporate purposes , including mitigating the dilutive impact of shares issued under employee benefit programs , and terminated the 2005 program . under this new program , we purchased 2.8 million shares of our common stock during 2006 , and as of december 31 , 2006 , 12.2 million shares were available for purchase . we utilize third-party broker-dealers to acquire common shares on the open market in the execution of our stock purchase program . in addition , shares may be acquired for other deferred compensation plans , held by an external trustee , that are not part of the common stock purchase program . as of december 31 , 2006 , on a cumulative basis , approximately 395000 shares have been purchased and are held in trust . these shares are recorded as treasury stock in our consolidated statement of condition . during 2006 , 2005 and 2004 , we purchased and recorded as treasury stock a total of 5.8 million shares , 13.1 million shares and 4.1 million shares , respectively , at an average historical cost per share of $ 63 , $ 51 and $ 43 , respectively . accumulated other comprehensive ( loss ) income: .
what percent did minimum pension liability increase between 2004 and 2006?
for the year ended december 31 , 2006 , we realized net gains of $ 15 million on sales of available-for- sale securities . unrealized losses of $ 7 million were included in other comprehensive income at december 31 , 2005 , net of deferred taxes of $ 4 million , related to these sales . seq 86 copyarea : 38 . x 54 . trimsize : 8.25 x 10.75 typeset state street corporation serverprocess c:\\fc\\delivery_1024177\\2771-1-dm_p.pdf chksum : 0 cycle 1merrill corporation 07-2771-1 thu mar 01 17:10:46 2007 ( v 2.247w--stp1pae18 ) .