determined that it will primarily be subject to the ietu in future periods , and as such it has recorded tax expense of approximately $ 20 million in 2007 for the deferred tax effects of the new ietu system . as of december 31 , 2007 , the company had us federal net operating loss carryforwards of approximately $ 206 million which will begin to expire in 2023 . of this amount , $ 47 million relates to the pre-acquisition period and is subject to limitation . the remaining $ 159 million is subject to limitation as a result of the change in stock ownership in may 2006 . this limitation is not expected to have a material impact on utilization of the net operating loss carryforwards . the company also had foreign net operating loss carryforwards as of december 31 , 2007 of approximately $ 564 million for canada , germany , mexico and other foreign jurisdictions with various expiration dates . net operating losses in canada have various carryforward periods and began expiring in 2007 . net operating losses in germany have no expiration date . net operating losses in mexico have a ten year carryforward period and begin to expire in 2009 . however , these losses are not available for use under the new ietu tax regulations in mexico . as the ietu is the primary system upon which the company will be subject to tax in future periods , no deferred tax asset has been reflected in the balance sheet as of december 31 , 2007 for these income tax loss carryforwards . the company adopted the provisions of fin 48 effective january 1 , 2007 . fin 48 clarifies the accounting for income taxes by prescribing a minimum recognition threshold a tax benefit is required to meet before being recognized in the financial statements . fin 48 also provides guidance on derecognition , measurement , classification , interest and penalties , accounting in interim periods , disclosure and transition . as a result of the implementation of fin 48 , the company increased retained earnings by $ 14 million and decreased goodwill by $ 2 million . in addition , certain tax liabilities for unrecognized tax benefits , as well as related potential penalties and interest , were reclassified from current liabilities to long-term liabilities . liabilities for unrecognized tax benefits as of december 31 , 2007 relate to various us and foreign jurisdictions . a reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows : year ended december 31 , 2007 ( in $ millions ) .

year ended december 31 2007 ( in $ millions ): balance as of january 1 2007: 193
increases in tax positions for the current year: 2
increases in tax positions for prior years: 28
decreases in tax positions of prior years: -21
settlements: -2
balance as of december 31 2007: 200

included in the unrecognized tax benefits of $ 200 million as of december 31 , 2007 is $ 56 million of tax benefits that , if recognized , would reduce the company 2019s effective tax rate . the company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes . as of december 31 , 2007 , the company has recorded a liability of approximately $ 36 million for interest and penalties . this amount includes an increase of approximately $ 13 million for the year ended december 31 , 2007 . the company operates in the united states ( including multiple state jurisdictions ) , germany and approximately 40 other foreign jurisdictions including canada , china , france , mexico and singapore . examinations are ongoing in a number of those jurisdictions including , most significantly , in germany for the years 2001 to 2004 . during the quarter ended march 31 , 2007 , the company received final assessments in germany for the prior examination period , 1997 to 2000 . the effective settlement of those examinations resulted in a reduction to goodwill of approximately $ 42 million with a net expected cash outlay of $ 29 million . the company 2019s celanese corporation and subsidiaries notes to consolidated financial statements 2014 ( continued ) %%transmsg*** transmitting job : y48011 pcn : 122000000 ***%%pcmsg|f-49 |00023|yes|no|02/26/2008 22:07|0|0|page is valid , no graphics -- color : d| .

Questions:
what was the account balance of unrecognized tax benefits as of 12/31/07?
and as of 1/1/07?
so what was the difference in the balance between these two dates?
and the specific value for 1/1/07 again?
so what was the percentage change during this time?

Answers:
2000
193
7
193
3.6%