what is the percentage change in the number of staff in 2012?
management 2019s discussion and analysis net interest income 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 . 2011 versus 2010 . net interest income on the consolidated statements of earnings was $ 5.19 billion for 2011 , 6% ( 6 % ) lower than 2010 . the decrease compared with 2010 was primarily due to higher interest expense related to our long-term borrowings and higher dividend expense related to financial instruments sold , but not yet purchased , partially offset by an increase in interest income from higher yielding collateralized agreements . 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 the context of more difficult economic and financial conditions , the firm launched an initiative during the second quarter of 2011 to identify areas where we can operate more efficiently and reduce our operating expenses . during 2012 and 2011 , we announced targeted annual run rate compensation and non-compensation reductions of approximately $ 1.9 billion in aggregate . the table below presents our operating expenses and total staff. .

|  | Year Ended December |
| :--- | :--- |
| <i>$ in millions</i> | 2012 | 2011 | 2010 |
| Compensation and benefits | $12,944 | $12,223 | $15,376 |
| U.K. bank payrolltax | — | — | 465 |
| Brokerage, clearing, exchange anddistribution fees | 2,208 | 2,463 | 2,281 |
| Market development | 509 | 640 | 530 |
| Communications and technology | 782 | 828 | 758 |
| Depreciation and amortization | 1,738 | 1,865 | 1,889 |
| Occupancy | 875 | 1,030 | 1,086 |
| Professional fees | 867 | 992 | 927 |
| Insurance reserves<sup>1</sup> | 598 | 529 | 398 |
| Other expenses | 2,435 | 2,072 | 2,559 |
| Total non-compensation expenses | 10,012 | 10,419 | 10,428 |
| Total operating expenses | $22,956 | $22,642 | $26,269 |
| Total staff atperiod-end<sup>2</sup> | 32,400 | 33,300 | 35,700 |

total staff at period-end 2 32400 33300 35700 1 . related revenues are included in 201cmarket making 201d on the consolidated statements of earnings . 2 . includes employees , consultants and temporary staff . 48 goldman sachs 2012 annual report .

staff_2012 = 32400
staff_2011 = 33300
change = staff_2012 - staff_2011
percent_change = change / staff_2011
answer = percent_change * 100