consolidated income statement review net income for 2009 was $ 2.4 billion and for 2008 was $ 914 million . amounts for 2009 include operating results of national city and the fourth quarter impact of a $ 687 million after-tax gain related to blackrock 2019s acquisition of bgi . increases in income statement comparisons to 2008 , except as noted , are primarily due to the operating results of national city . our consolidated income statement is presented in item 8 of this report . net interest income and net interest margin year ended december 31 dollars in millions 2009 2008 .

2009: net interest income: 9083
net interest margin: -3.82
2008: net interest income: 3854
net interest margin: -3.37

changes in net interest income and margin result from the interaction of the volume and composition of interest-earning assets and related yields , interest-bearing liabilities and related rates paid , and noninterest-bearing sources of funding . see statistical information 2013 analysis of year-to-year changes in net interest ( unaudited ) income and average consolidated balance sheet and net interest analysis in item 8 of this report for additional information . higher net interest income for 2009 compared with 2008 reflected the increase in average interest-earning assets due to national city and the improvement in the net interest margin . the net interest margin was 3.82% ( 3.82 % ) for 2009 and 3.37% ( 3.37 % ) for 2008 . the following factors impacted the comparison : 2022 a decrease in the rate accrued on interest-bearing liabilities of 97 basis points . the rate accrued on interest-bearing deposits , the largest component , decreased 107 basis points . 2022 these factors were partially offset by a 45 basis point decrease in the yield on interest-earning assets . the yield on loans , which represented the largest portion of our earning assets in 2009 , decreased 30 basis points . 2022 in addition , the impact of noninterest-bearing sources of funding decreased 7 basis points . for comparing to the broader market , the average federal funds rate was .16% ( .16 % ) for 2009 compared with 1.94% ( 1.94 % ) for 2008 . we expect our net interest income for 2010 will likely be modestly lower as a result of cash recoveries on purchased impaired loans in 2009 and additional run-off of higher- yielding assets , which could be mitigated by rising interest rates . this assumes our current expectations for interest rates and economic conditions 2013 we include our current economic assumptions underlying our forward-looking statements in the cautionary statement regarding forward-looking information section of this item 7 . noninterest income summary noninterest income was $ 7.1 billion for 2009 and $ 2.4 billion for 2008 . noninterest income for 2009 included the following : 2022 the gain on blackrock/bgi transaction of $ 1.076 billion , 2022 net credit-related other-than-temporary impairments ( otti ) on debt and equity securities of $ 577 million , 2022 net gains on sales of securities of $ 550 million , 2022 gains on hedging of residential mortgage servicing rights of $ 355 million , 2022 valuation and sale income related to our commercial mortgage loans held for sale , net of hedges , of $ 107 million , 2022 gains of $ 103 million related to our blackrock ltip shares adjustment in the first quarter , and net losses on private equity and alternative investments of $ 93 million . noninterest income for 2008 included the following : 2022 net otti on debt and equity securities of $ 312 million , 2022 gains of $ 246 million related to our blackrock ltip shares adjustment , 2022 valuation and sale losses related to our commercial mortgage loans held for sale , net of hedges , of $ 197 million , 2022 impairment and other losses related to private equity and alternative investments of $ 180 million , 2022 income from hilliard lyons totaling $ 164 million , including the first quarter gain of $ 114 million from the sale of this business , 2022 net gains on sales of securities of $ 106 million , and 2022 a gain of $ 95 million related to the redemption of a portion of our visa class b common shares related to visa 2019s march 2008 initial public offering . additional analysis asset management revenue increased $ 172 million to $ 858 million in 2009 , compared with $ 686 million in 2008 . this increase reflected improving equity markets , new business generation and a shift in assets into higher yielding equity investments during the second half of 2009 . assets managed totaled $ 103 billion at both december 31 , 2009 and 2008 , including the impact of national city . the asset management group section of the business segments review section of this item 7 includes further discussion of assets under management . consumer services fees totaled $ 1.290 billion in 2009 compared with $ 623 million in 2008 . service charges on deposits totaled $ 950 million for 2009 and $ 372 million for 2008 . both increases were primarily driven by the impact of the national city acquisition . reduced consumer spending .

Questions:
what was the net interest margin ( in % ) in the year of 2009?
and what was it in 2008?
what was, then, the total net interest margin ( in % ) in both of those years?
and what is the average net interest margin between those years?

Answers:
3.82
3.37
7.2
3.6