stockholders 2019 equity derivative instruments activity , net of tax , included in non-owner changes to equity within the consolidated statements of stockholders 2019 equity for the years ended december 31 , 2008 , 2007 and 2006 is as follows: .

2008: balance at january 1: 2014
increase ( decrease ) in fair value: -9
reclassifications to earnings: 2
balance at december 31: -7
2007: balance at january 1: 16
increase ( decrease ) in fair value: -6
reclassifications to earnings: -10
balance at december 31: 2014
2006: balance at january 1: 2
increase ( decrease ) in fair value: 75
reclassifications to earnings: -61
balance at december 31: 16

net investment in foreign operations hedge at december 31 , 2008 and 2007 , the company did not have any hedges of foreign currency exposure of net investments in foreign operations . investments hedge during the first quarter of 2006 , the company entered into a zero-cost collar derivative ( the 201csprint nextel derivative 201d ) to protect itself economically against price fluctuations in its 37.6 million shares of sprint nextel corporation ( 201csprint nextel 201d ) non-voting common stock . during the second quarter of 2006 , as a result of sprint nextel 2019s spin-off of embarq corporation through a dividend to sprint nextel shareholders , the company received approximately 1.9 million shares of embarq corporation . the floor and ceiling prices of the sprint nextel derivative were adjusted accordingly . the sprint nextel derivative was not designated as a hedge under the provisions of sfas no . 133 , 201caccounting for derivative instruments and hedging activities . 201d accordingly , to reflect the change in fair value of the sprint nextel derivative , the company recorded a net gain of $ 99 million for the year ended december 31 , 2006 , included in other income ( expense ) in the company 2019s consolidated statements of operations . in december 2006 , the sprint nextel derivative was terminated and settled in cash and the 37.6 million shares of sprint nextel were converted to common shares and sold . the company received aggregate cash proceeds of approximately $ 820 million from the settlement of the sprint nextel derivative and the subsequent sale of the 37.6 million sprint nextel shares . the company recognized a loss of $ 126 million in connection with the sale of the remaining shares of sprint nextel common stock . as described above , the company recorded a net gain of $ 99 million in connection with the sprint nextel derivative . fair value of financial instruments the company 2019s financial instruments include cash equivalents , sigma fund investments , short-term investments , accounts receivable , long-term receivables , accounts payable , accrued liabilities , derivatives and other financing commitments . the company 2019s sigma fund , available-for-sale investment portfolios and derivatives are recorded in the company 2019s consolidated balance sheets at fair value . all other financial instruments , with the exception of long-term debt , are carried at cost , which is not materially different than the instruments 2019 fair values . using quoted market prices and market interest rates , the company determined that the fair value of long- term debt at december 31 , 2008 was $ 2.8 billion , compared to a carrying value of $ 4.1 billion . since considerable judgment is required in interpreting market information , the fair value of the long-term debt is not necessarily indicative of the amount which could be realized in a current market exchange . equity price market risk at december 31 , 2008 , the company 2019s available-for-sale equity securities portfolio had an approximate fair market value of $ 128 million , which represented a cost basis of $ 125 million and a net unrealized loss of $ 3 million . these equity securities are held for purposes other than trading . %%transmsg*** transmitting job : c49054 pcn : 105000000 ***%%pcmsg|102 |00022|yes|no|02/23/2009 19:17|0|0|page is valid , no graphics -- color : n| .

Questions:
what was the balance of stockholder equity in the end of 2006?
and what was it in the beginning of that year?
what was, then, the change in that balance throughout 2006?
what was the balance of stockholder equity in the beginning of 2006?
and how much does that change represent in relation to this beginning of the year balance, in percentage?

Answers:
16
2
14
2
700%