corporate & institutional banking corporate & institutional banking earned $ 1.9 billion in 2011 and $ 1.8 billion in 2010 . the increase in earnings was primarily due to an improvement in the provision for credit losses , which was a benefit in 2011 , partially offset by a reduction in the value of commercial mortgage servicing rights and lower net interest income . we continued to focus on adding new clients , increasing cross sales , and remaining committed to strong expense discipline . asset management group asset management group earned $ 141 million for 2011 compared with $ 137 million for 2010 . assets under administration were $ 210 billion at december 31 , 2011 and $ 212 billion at december 31 , 2010 . earnings for 2011 reflected a benefit from the provision for credit losses and growth in noninterest income , partially offset by higher noninterest expense and lower net interest income . for 2011 , the business delivered strong sales production , grew high value clients and benefitted from significant referrals from other pnc lines of business . over time and with stabilized market conditions , the successful execution of these strategies and the accumulation of our strong sales performance are expected to create meaningful growth in assets under management and noninterest income . residential mortgage banking residential mortgage banking earned $ 87 million in 2011 compared with $ 269 million in 2010 . the decline in earnings was driven by an increase in noninterest expense associated with increased costs for residential mortgage foreclosure- related expenses , primarily as a result of ongoing governmental matters , and lower net interest income , partially offset by an increase in loan originations and higher loans sales revenue . blackrock our blackrock business segment earned $ 361 million in 2011 and $ 351 million in 2010 . the higher business segment earnings from blackrock for 2011 compared with 2010 were primarily due to an increase in revenue . non-strategic assets portfolio this business segment ( formerly distressed assets portfolio ) consists primarily of acquired non-strategic assets that fall outside of our core business strategy . non-strategic assets portfolio had earnings of $ 200 million in 2011 compared with a loss of $ 57 million in 2010 . the increase was primarily attributable to a lower provision for credit losses partially offset by lower net interest income . 201cother 201d reported earnings of $ 376 million for 2011 compared with earnings of $ 386 million for 2010 . the decrease in earnings primarily reflected the noncash charge related to the redemption of trust preferred securities in the fourth quarter of 2011 and the gain related to the sale of a portion of pnc 2019s blackrock shares in 2010 partially offset by lower integration costs in 2011 . consolidated income statement review our consolidated income statement is presented in item 8 of this report . net income for 2011 was $ 3.1 billion compared with $ 3.4 billion for 2010 . results for 2011 include the impact of $ 324 million of residential mortgage foreclosure-related expenses primarily as a result of ongoing governmental matters , a $ 198 million noncash charge related to redemption of trust preferred securities and $ 42 million for integration costs . results for 2010 included the $ 328 million after-tax gain on our sale of gis , $ 387 million for integration costs , and $ 71 million of residential mortgage foreclosure-related expenses . for 2010 , net income attributable to common shareholders was also impacted by a noncash reduction of $ 250 million in connection with the redemption of tarp preferred stock . pnc 2019s results for 2011 were driven by good performance in a challenging environment of low interest rates , slow economic growth and new regulations . net interest income and net interest margin year ended december 31 dollars in millions 2011 2010 .

Table: year ended december 31dollars in millions 2011 2010 net interest income $ 8700 $ 9230 net interest margin 3.92% ( 3.92 % ) 4.14% ( 4.14 % )

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 analysis of year-to-year changes in net interest income and average consolidated balance sheet and net interest analysis in item 8 and the discussion of purchase accounting accretion in the consolidated balance sheet review in item 7 of this report for additional information . the decreases in net interest income and net interest margin for 2011 compared with 2010 were primarily attributable to a decrease in purchase accounting accretion on purchased impaired loans primarily due to lower excess cash recoveries . a decline in average loan balances and the low interest rate environment , partially offset by lower funding costs , also contributed to the decrease . the pnc financial services group , inc . 2013 form 10-k 35 .

Question: in 2011 and 2010 what was the average net interest income in millions
Answer: 8965
Calculation: divide(add(add(8700, 9230), const_2), const_2)