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.

Text: 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. . <table class='wikitable'><tr><td>1</td><td>$ in millions</td><td>year ended december 2012</td><td>year ended december 2011</td><td>year ended december 2010</td></tr><tr><td>2</td><td>compensation and benefits</td><td>$ 12944</td><td>$ 12223</td><td>$ 15376</td></tr><tr><td>3</td><td>u.k . bank payrolltax</td><td>2014</td><td>2014</td><td>465</td></tr><tr><td>4</td><td>brokerage clearing exchange anddistribution fees</td><td>2208</td><td>2463</td><td>2281</td></tr><tr><td>5</td><td>market development</td><td>509</td><td>640</td><td>530</td></tr><tr><td>6</td><td>communications and technology</td><td>782</td><td>828</td><td>758</td></tr><tr><td>7</td><td>depreciation and amortization</td><td>1738</td><td>1865</td><td>1889</td></tr><tr><td>8</td><td>occupancy</td><td>875</td><td>1030</td><td>1086</td></tr><tr><td>9</td><td>professional fees</td><td>867</td><td>992</td><td>927</td></tr><tr><td>10</td><td>insurance reserves1</td><td>598</td><td>529</td><td>398</td></tr><tr><td>11</td><td>other expenses</td><td>2435</td><td>2072</td><td>2559</td></tr><tr><td>12</td><td>total non-compensation expenses</td><td>10012</td><td>10419</td><td>10428</td></tr><tr><td>13</td><td>total operating expenses</td><td>$ 22956</td><td>$ 22642</td><td>$ 26269</td></tr><tr><td>14</td><td>total staff atperiod-end2</td><td>32400</td><td>33300</td><td>35700</td></tr></table> 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 .
Question: what were the total operating expenses in 2012, in millions?
Answer: 22956.0
Question: and what were they in 2011, also in millions?
Answer: 22642.0
Question: what was, then, in millions, the change in operating expenses from 2011 to 2012?

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