hr solutions .

2010: revenue: 2111
operating income: 234
operating margin: -11.1
2009: revenue: 1267
operating income: 203
operating margin: -16
2008: revenue: 1356
operating income: 208
operating margin: -15.3

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 .

Questions:
what was the revenue in 2010?
and in 2009?
so how much did this value change between the two years?
and the specific value for 2009 again?
so what was the percentage change?

Answers:
2111
1267
844
1267
66.6%