consolidated income statement review our consolidated income statement is presented in item 8 of this report . net income for 2012 was $ 3.0 billion compared with $ 3.1 billion for 2011 . revenue growth of 8 percent and a decline in the provision for credit losses were more than offset by a 16 percent increase in noninterest expense in 2012 compared to 2011 . further detail is included in the net interest income , noninterest income , provision for credit losses and noninterest expense portions of this consolidated income statement review . net interest income table 2 : net interest income and net interest margin year ended december 31 dollars in millions 2012 2011 .

2012: net interest income: 9640
net interest margin: -3.94
2011: net interest income: 8700
net interest margin: -3.92

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 the statistical information ( unaudited ) 2013 average consolidated balance sheet and net interest analysis and analysis of year-to-year changes in net interest income in item 8 of this report and the discussion of purchase accounting accretion of purchased impaired loans in the consolidated balance sheet review in this item 7 for additional information . the increase in net interest income in 2012 compared with 2011 was primarily due to the impact of the rbc bank ( usa ) acquisition , organic loan growth and lower funding costs . purchase accounting accretion remained stable at $ 1.1 billion in both periods . the net interest margin was 3.94% ( 3.94 % ) for 2012 and 3.92% ( 3.92 % ) for 2011 . the increase in the comparison was primarily due to a decrease in the weighted-average rate accrued on total interest- bearing liabilities of 29 basis points , largely offset by a 21 basis point decrease on the yield on total interest-earning assets . the decrease in the rate on interest-bearing liabilities was primarily due to the runoff of maturing retail certificates of deposit and the redemption of additional trust preferred and hybrid capital securities during 2012 , in addition to an increase in fhlb borrowings and commercial paper as lower-cost funding sources . the decrease in the yield on interest-earning assets was primarily due to lower rates on new loan volume and lower yields on new securities in the current low rate environment . with respect to the first quarter of 2013 , we expect net interest income to decline by two to three percent compared to fourth quarter 2012 net interest income of $ 2.4 billion , due to a decrease in purchase accounting accretion of up to $ 50 to $ 60 million , including lower expected cash recoveries . for the full year 2013 , we expect net interest income to decrease compared with 2012 , assuming an expected decline in purchase accounting accretion of approximately $ 400 million , while core net interest income is expected to increase in the year-over-year comparison . we believe our net interest margin will come under pressure in 2013 , due to the expected decline in purchase accounting accretion and assuming that the current low rate environment continues . noninterest income noninterest income totaled $ 5.9 billion for 2012 and $ 5.6 billion for 2011 . the overall increase in the comparison was primarily due to an increase in residential mortgage loan sales revenue driven by higher loan origination volume , gains on sales of visa class b common shares and higher corporate service fees , largely offset by higher provision for residential mortgage repurchase obligations . asset management revenue , including blackrock , totaled $ 1.2 billion in 2012 compared with $ 1.1 billion in 2011 . this increase was primarily due to higher earnings from our blackrock investment . discretionary assets under management increased to $ 112 billion at december 31 , 2012 compared with $ 107 billion at december 31 , 2011 driven by stronger average equity markets , positive net flows and strong sales performance . for 2012 , consumer services fees were $ 1.1 billion compared with $ 1.2 billion in 2011 . the decline reflected the regulatory impact of lower interchange fees on debit card transactions partially offset by customer growth . as further discussed in the retail banking portion of the business segments review section of this item 7 , the dodd-frank limits on interchange rates were effective october 1 , 2011 and had a negative impact on revenue of approximately $ 314 million in 2012 and $ 75 million in 2011 . this impact was partially offset by higher volumes of merchant , customer credit card and debit card transactions and the impact of the rbc bank ( usa ) acquisition . corporate services revenue increased by $ .3 billion , or 30 percent , to $ 1.2 billion in 2012 compared with $ .9 billion in 2011 due to higher commercial mortgage servicing revenue and higher merger and acquisition advisory fees in 2012 . the major components of corporate services revenue are treasury management revenue , corporate finance fees , including revenue from capital markets-related products and services , and commercial mortgage servicing revenue , including commercial mortgage banking activities . see the product revenue portion of this consolidated income statement review for further detail . the pnc financial services group , inc . 2013 form 10-k 39 .

Questions:
what was the total net interest income for the years of 2011 and 2012, combined?
and how many years are those?
what was, then, the average net interest income between those years?

Answers:
18340
2
9170