pre_text: management 2019s discussion and analysis net interest income 2013 versus 2012 . net interest income on the consolidated statements of earnings was $ 3.39 billion for 2013 , 13% ( 13 % ) lower than 2012 . the decrease compared with 2012 was primarily due to lower average yields on financial instruments owned , at fair value , partially offset by lower interest expense on financial instruments sold , but not yet purchased , at fair value and collateralized financings . 2012 versus 2011 . net interest income on the consolidated statements of earnings was $ 3.88 billion for 2012 , 25% ( 25 % ) lower than 2011 . the decrease compared with 2011 was primarily due to lower average yields on financial instruments owned , at fair value and collateralized agreements . see 201cstatistical 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 . the table below presents our operating expenses and total staff ( which includes employees , consultants and temporary staff ) . .
post_text: 1 . related revenues are included in 201cmarket making 201d in the consolidated statements of earnings . goldman sachs 2013 annual report 45 .
table: Year Ended December
table: <i>$ in millions</i> 2013 2012 2011
table: Compensation and benefits $12,613 $12,944 $12,223
table: Brokerage, clearing, exchange anddistribution fees 2,341 2,208 2,463
table: Market development 541 509 640
table: Communications and technology 776 782 828
table: Depreciation and amortization 1,322 1,738 1,865
table: Occupancy 839 875 1,030
table: Professional fees 930 867 992
table: Insurance reserves<sup>1</sup> 176 598 529
table: Other expenses 2,931 2,435 2,072
table: Total non-compensation expenses 9,856 10,012 10,419
table: Total operating expenses $22,469 $22,956 $22,642
table: Total staff at period-end 32,900 32,400 33,300
question: Analyse this data from a financial earnings document. what is the percentage change in staff number in 2013?