pre_text: hr solutions .
post_text: in october 2010 , we completed the acquisition of hewitt , one of the world 2019s leading human resource consulting and outsourcing companies . hewitt operates globally together with aon 2019s existing consulting and outsourcing operations under the newly created aon hewitt brand . hewitt 2019s operating results are included in aon 2019s results of operations beginning october 1 , 2010 . our hr solutions segment generated approximately 25% ( 25 % ) of our consolidated total revenues in 2010 and provides a broad range of human capital services , as follows : consulting services : 2022 health and benefits advises clients about how to structure , fund , and administer employee benefit programs that attract , retain , and motivate employees . benefits consulting includes health and welfare , executive benefits , workforce strategies and productivity , absence management , benefits administration , data-driven health , compliance , employee commitment , investment advisory and elective benefits services . 2022 retirement specializes in global actuarial services , defined contribution consulting , investment consulting , tax and erisa consulting , and pension administration . 2022 compensation focuses on compensatory advisory/counsel including : compensation planning design , executive reward strategies , salary survey and benchmarking , market share studies and sales force effectiveness , with special expertise in the financial services and technology industries . 2022 strategic human capital delivers advice to complex global organizations on talent , change and organizational effectiveness issues , including talent strategy and acquisition , executive on-boarding , performance management , leadership assessment and development , communication strategy , workforce training and change management . outsourcing services : 2022 benefits outsourcing applies our hr expertise primarily through defined benefit ( pension ) , defined contribution ( 401 ( k ) ) , and health and welfare administrative services . our model replaces the resource-intensive processes once required to administer benefit plans with more efficient , effective , and less costly solutions . 2022 human resource business processing outsourcing ( 2018 2018hr bpo 2019 2019 ) provides market-leading solutions to manage employee data ; administer benefits , payroll and other human resources processes ; and record and manage talent , workforce and other core hr process transactions as well as other complementary services such as absence management , flexible spending , dependent audit and participant advocacy . beginning in late 2008 , the disruption in the global credit markets and the deterioration of the financial markets created significant uncertainty in the marketplace . weak economic conditions globally continued throughout 2010 . the prolonged economic downturn is adversely impacting our clients 2019 financial condition and therefore the levels of business activities in the industries and geographies where we operate . while we believe that the majority of our practices are well positioned to manage through this time , these challenges are reducing demand for some of our services and putting .
table: Years ended December 31, 2010 2009 2008
table: Revenue $2,111 $1,267 $1,356
table: Operating income 234 203 208
table: Operating margin 11.1% 16.0% 15.3%
question: Analyse this data from a financial earnings document. what was the percentage change in the revenues from 2009 to 2010