Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: remitted to the u.s . due to foreign tax credits and exclusions that may become available at the time of remittance . at december 31 , 2010 , aon had domestic federal operating loss carryforwards of $ 56 million that will expire at various dates from 2011 to 2024 , state operating loss carryforwards of $ 610 million that will expire at various dates from 2011 to 2031 , and foreign operating and capital loss carryforwards of $ 720 million and $ 251 million , respectively , nearly all of which are subject to indefinite carryforward . unrecognized tax provisions the following is a reconciliation of the company 2019s beginning and ending amount of unrecognized tax benefits ( in millions ) : . <table class='wikitable'><tr><td>1</td><td>-</td><td>2010</td><td>2009</td></tr><tr><td>2</td><td>balance at january 1</td><td>$ 77</td><td>$ 86</td></tr><tr><td>3</td><td>additions based on tax positions related to the current year</td><td>7</td><td>2</td></tr><tr><td>4</td><td>additions for tax positions of prior years</td><td>4</td><td>5</td></tr><tr><td>5</td><td>reductions for tax positions of prior years</td><td>-7 ( 7 )</td><td>-11 ( 11 )</td></tr><tr><td>6</td><td>settlements</td><td>-1 ( 1 )</td><td>-10 ( 10 )</td></tr><tr><td>7</td><td>lapse of statute of limitations</td><td>-5 ( 5 )</td><td>-3 ( 3 )</td></tr><tr><td>8</td><td>acquisitions</td><td>26</td><td>6</td></tr><tr><td>9</td><td>foreign currency translation</td><td>-1 ( 1 )</td><td>2</td></tr><tr><td>10</td><td>balance at december 31</td><td>$ 100</td><td>$ 77</td></tr></table> as of december 31 , 2010 , $ 85 million of unrecognized tax benefits would impact the effective tax rate if recognized . aon does not expect the unrecognized tax positions to change significantly over the next twelve months , except for a potential reduction of unrecognized tax benefits in the range of $ 10-$ 15 million relating to anticipated audit settlements . the company recognizes penalties and interest related to unrecognized income tax benefits in its provision for income taxes . aon accrued potential penalties of less than $ 1 million during each of 2010 , 2009 and 2008 . aon accrued interest of less than $ 1 million in 2010 , $ 2 million during 2009 and less than $ 1 million in 2008 . aon has recorded a liability for penalties of $ 5 million and for interest of $ 18 million for both december 31 , 2010 and 2009 . aon and its subsidiaries file income tax returns in the u.s . federal jurisdiction as well as various state and international jurisdictions . aon has substantially concluded all u.s . federal income tax matters for years through 2006 . material u.s . state and local income tax jurisdiction examinations have been concluded for years through 2002 . aon has concluded income tax examinations in its primary international jurisdictions through 2004. .
Question: what was the net change in the unrecognized tax during 2010?
Answer: 23.0
Question: and for that year and the one before, what was the total accrued interest by aon, in millions?
Answer: 3.0
Question: and what is the average between the two years?

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