human
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.
Please answer the following question with expressions if necessary.
how much, then, does that change represent in relation to this 2011 total?
assistant
subtract(32400, 33300), divide(#0, 33300)