Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


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 ) . . <table class='wikitable'><tr><td>1</td><td>$ in millions</td><td>year ended december 2013</td><td>year ended december 2012</td><td>year ended december 2011</td></tr><tr><td>2</td><td>compensation and benefits</td><td>$ 12613</td><td>$ 12944</td><td>$ 12223</td></tr><tr><td>3</td><td>brokerage clearing exchange anddistribution fees</td><td>2341</td><td>2208</td><td>2463</td></tr><tr><td>4</td><td>market development</td><td>541</td><td>509</td><td>640</td></tr><tr><td>5</td><td>communications and technology</td><td>776</td><td>782</td><td>828</td></tr><tr><td>6</td><td>depreciation and amortization</td><td>1322</td><td>1738</td><td>1865</td></tr><tr><td>7</td><td>occupancy</td><td>839</td><td>875</td><td>1030</td></tr><tr><td>8</td><td>professional fees</td><td>930</td><td>867</td><td>992</td></tr><tr><td>9</td><td>insurance reserves1</td><td>176</td><td>598</td><td>529</td></tr><tr><td>10</td><td>other expenses</td><td>2931</td><td>2435</td><td>2072</td></tr><tr><td>11</td><td>total non-compensation expenses</td><td>9856</td><td>10012</td><td>10419</td></tr><tr><td>12</td><td>total operating expenses</td><td>$ 22469</td><td>$ 22956</td><td>$ 22642</td></tr><tr><td>13</td><td>total staff at period-end</td><td>32900</td><td>32400</td><td>33300</td></tr></table> 1 . related revenues are included in 201cmarket making 201d in the consolidated statements of earnings . goldman sachs 2013 annual report 45 .
Question: what percentage did the net interest income in 2012 represent in relation to the 2011 one?
Answer: 75.0
Question: and what was that 2012 net interest income?
Answer: 3.88
Question: considering this net interest income and the percentage of the 2011 one it represented, what was the 2011 net interest income?
Answer: 0.05173
Question: and from 2012 to 2013, what was the change in the staff number?

500.0