the goldman sachs group , inc . and subsidiaries management 2019s discussion and analysis non-interest revenues . investment banking revenues in the consolidated statements of earnings were $ 7.03 billion for 2015 , 9% ( 9 % ) higher than 2014 , due to significantly higher revenues in financial advisory , reflecting strong client activity , particularly in the u.s . industry-wide completed mergers and acquisitions increased significantly compared with the prior year . revenues in underwriting were lower compared with a strong 2014 . revenues in debt underwriting were lower compared with 2014 , reflecting significantly lower leveraged finance activity . revenues in equity underwriting were also lower , reflecting significantly lower revenues from initial public offerings and convertible offerings , partially offset by significantly higher revenues from secondary offerings . investment management revenues in the consolidated statements of earnings were $ 5.87 billion for 2015 , 2% ( 2 % ) higher than 2014 , due to slightly higher management and other fees , primarily reflecting higher average assets under supervision , and higher transaction revenues . commissions and fees in the consolidated statements of earnings were $ 3.32 billion for 2015 , essentially unchanged compared with 2014 . market-making revenues in the consolidated statements of earnings were $ 9.52 billion for 2015 , 14% ( 14 % ) higher than 2014 . excluding a gain of $ 289 million in 2014 related to the extinguishment of certain of our junior subordinated debt , market-making revenues were 18% ( 18 % ) higher than 2014 , reflecting significantly higher revenues in interest rate products , currencies , equity cash products and equity derivatives . these increases were partially offset by significantly lower revenues in mortgages , commodities and credit products . other principal transactions revenues in the consolidated statements of earnings were $ 5.02 billion for 2015 , 24% ( 24 % ) lower than 2014 . this decrease was primarily due to lower revenues from investments in equities , principally reflecting the sale of metro international trade services ( metro ) in the fourth quarter of 2014 and lower net gains from investments in private equities , driven by corporate performance . in addition , revenues in debt securities and loans were significantly lower , reflecting lower net gains from investments . net interest income . net interest income in the consolidated statements of earnings was $ 3.06 billion for 2015 , 24% ( 24 % ) lower than 2014 . the decrease compared with 2014 was due to lower interest income resulting from a reduction in interest income related to financial instruments owned , at fair value , partially offset by the impact of an increase in total average loans receivable . the decrease in interest income was partially offset by a decrease in interest expense , which primarily reflected lower interest expense related to financial instruments sold , but not yet purchased , at fair value and other interest-bearing liabilities , partially offset by higher interest expense related to long-term borrowings . see 201csupplemental financial information 2014 statistical disclosures 2014 distribution of assets , liabilities and shareholders 2019 equity 201d for further information about our sources of net interest income . operating expenses our operating expenses are primarily influenced by compensation , headcount and levels of business activity . compensation and benefits includes salaries , discretionary compensation , amortization of equity awards and other items such as benefits . discretionary compensation is significantly impacted by , among other factors , the level of net revenues , overall financial performance , prevailing labor markets , business mix , the structure of our share- based compensation programs and the external environment . in addition , see 201cuse of estimates 201d for additional information about expenses that may arise from litigation and regulatory proceedings . in the context of the challenging environment during the first half of 2016 , we completed an initiative that identified areas where we can operate more efficiently , resulting in a reduction of approximately $ 900 million in annual run rate compensation . for 2016 , net savings from this initiative , after severance and other related costs , were approximately $ 500 million . the table below presents our operating expenses and total staff ( which includes employees , consultants and temporary staff ) . .
what is the net change in the number of staff in 2015?
56 goldman sachs 2016 form 10-k .