the following table presents a rollforward of the severance and other costs for approximately 1650 employees included in the 2010 restructuring charg- in millions severance and other .

Table:
in millions | severance and other
opening balance ( recorded first quarter 2010 ) | $ 20
additions and adjustments | 26
cash charges in 2010 | -32 ( 32 )
cash charges in 2011 | -8 ( 8 )
cash charges in 2012 | -4 ( 4 )
balance december 31 2012 | $ 2
as of december 31 , 2012 , 1638 employees had left the company under these programs .
cellulosic bio-fuel tax credit in a memorandum dated june 28 , 2010 , the irs concluded that black liquor would qualify for the cellulosic bio-fuel tax credit of $ 1.01 per gallon pro- duced in 2009 .
on october 15 , 2010 , the irs ruled that companies may qualify in the same year for the $ 0.50 per gallon alternative fuel mixture credit and the $ 1.01 cellulosic bio-fuel tax credit for 2009 , but not for the same gallons of fuel produced and con- sumed .
to the extent a taxpayer changes its position and uses the $ 1.01 credit , it must re-pay the refunds they received as alternative fuel mixture credits attributable to the gallons converted to the cellulosic bio-fuel credit .
the repayment of this refund must include interest .
one important difference between the two credits is that the $ 1.01 credit must be credited against a company 2019s federal tax liability , and the credit may be carried forward through 2015 .
in contrast , the $ 0.50 credit is refundable in cash .
also , the cellulosic bio- fuel credit is required to be included in federal tax- able income .
the company filed an application with the irs on november 18 , 2010 , to receive the required registra- tion code to become a registered cellulosic bio-fuel producer .
the company received its registration code on february 28 , 2011 .
the company has evaluated the optimal use of the two credits with respect to gallons produced in 2009 .
considerations include uncertainty around future federal taxable income , the taxability of the alter- native fuel mixture credit , future liquidity and uses of cash such as , but not limited to , acquisitions , debt repayments and voluntary pension contributions versus repayment of alternative fuel mixture credits with interest .
at the present time , the company does not intend to convert any gallons under the alter- native fuel mixture credit to gallons under the cellulosic bio-fuel credit .
on july 19 , 2011 the com- pany filed an amended 2009 tax return claiming alternative fuel mixture tax credits as non-taxable income .
if that amended position is not upheld , the company will re-evaluate its position with regard to alternative fuel mixture gallons produced in 2009 .
during 2009 , the company produced 64 million gal- lons of black liquor that were not eligible for the alternative fuel mixture credit .
the company claimed these gallons for the cellulosic bio-fuel credit by amending the company 2019s 2009 tax return .
the impact of this amendment was included in the company 2019s 2010 fourth quarter income tax provision ( benefit ) , resulting in a $ 40 million net credit to tax expense .
temple-inland , inc .
also recognized an income tax benefit of $ 83 million in 2010 related to cellulosic bio-fuel credits .
as is the case with other tax credits , taxpayer claims are subject to possible future review by the irs which has the authority to propose adjustments to the amounts claimed , or credits received .
note 5 acquisitions and joint ventures acquisitions 2013 : on january 3 , 2013 , international paper completed the acquisition ( effective date of acquis- ition on january 1 , 2013 ) of the shares of its joint venture partner , sabanci holding , in the turkish corrugated packaging company , olmuksa interna- tional paper sabanci ambalaj sanayi ve ticaret a.s .
( olmuksa ) , for a purchase price of $ 56 million .
the acquired shares represent 43.7% ( 43.7 % ) of olmuksa 2019s shares , and prior to this acquisition , international paper already held a 43.7% ( 43.7 % ) equity interest in olmuk- sa .
thus , international paper now owns 87.4% ( 87.4 % ) of olmuksa 2019s outstanding and issued shares .
the company has not completed the valuation of assets acquired and liabilities assumed ; however , the company anticipates providing a preliminary pur- chase price allocation in its 2013 first quarter form 10-q filing .
because the transaction resulted in international paper becoming the majority shareholder , owning 87.4% ( 87.4 % ) of olmuksa 2019s shares , its completion triggered a mandatory call for tender of the remaining public shares .
also as a result of international paper taking majority control of the entity , olmuksa 2019s financial results will be consolidated with our industrial pack- aging segment beginning with the effective date international paper obtained majority control of the entity on january 1 , 2013 .
pro forma information related to the acquisition of olmuksa has not been included as it does not have a material effect on the company 2019s consolidated results of operations .
2012 : on february 13 , 2012 , international paper com- pleted the acquisition of temple-inland , inc .
( temple- inland ) .
international paper acquired all of the outstanding common stock of temple-inland for $ 32.00 per share in cash , totaling approximately $ 3.7 billion .

Question: based on the review of the table what was the net change in the restructuring charg- in millions severance and other in millions
Answer: -18
Calculation: subtract(2, 20)