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 ) . .

Year Ended December
<i>$ in millions</i>
2016
2015
2014
Compensation and benefits
$11,647
$12,678
$12,691
Brokerage, clearing, exchange anddistribution fees
2,555
2,576
2,501
Market development
457
557
549
Communications and technology
809
806
779
Depreciation and amortization
998
991
1,337
Occupancy
788
772
827
Professional fees
882
963
902
Other expenses
2,168
5,699
2,585
Total non-compensation expenses
8,657
12,364
9,480
Total operating expenses
$20,304
$25,042
$22,171
Total staff at period-end
34,400
36,800
34,000

56 goldman sachs 2016 form 10-k .

Question: Analyse this data from a financial earnings document. what is the net change in the number of staff in 2015?
Choices:
2400
400
2800.0
0
-24520
Correct choice index: 2