2022 net derivative losses of $ 13 million .review by segment general we serve clients through the following segments : 2022 risk solutions acts as an advisor and insurance and reinsurance broker , helping clients manage their risks , via consultation , as well as negotiation and placement of insurance risk with insurance carriers through our global distribution network .2022 hr solutions partners with organizations to solve their most complex benefits , talent and related financial challenges , and improve business performance by designing , implementing , communicating and administering a wide range of human capital , retirement , investment management , health care , compensation and talent management strategies .risk solutions .
[['years ended december 31,', '2011', '2010', '2009'], ['revenue', '$ 6817', '$ 6423', '$ 6305'], ['operating income', '1314', '1194', '900'], ['operating margin', '19.3% ( 19.3 % )', '18.6% ( 18.6 % )', '14.3% ( 14.3 % )']]
the demand for property and casualty insurance generally rises as the overall level of economic activity increases and generally falls as such activity decreases , affecting both the commissions and fees generated by our brokerage business .the economic activity that impacts property and casualty insurance is described as exposure units , and is closely correlated with employment levels , corporate revenue and asset values .during 2011 we began to see some improvement in pricing ; however , we would still consider this to be a 2018 2018soft market , 2019 2019 which began in 2007 .in a soft market , premium rates flatten or decrease , along with commission revenues , due to increased competition for market share among insurance carriers or increased underwriting capacity .changes in premiums have a direct and potentially material impact on the insurance brokerage industry , as commission revenues are generally based on a percentage of the premiums paid by insureds .in 2011 , pricing showed signs of stabilization and improvement in both our retail and reinsurance brokerage product lines and we expect this trend to slowly continue into 2012 .additionally , beginning in late 2008 and continuing through 2011 , we faced difficult conditions as a result of unprecedented disruptions in the global economy , the repricing of credit risk and the deterioration of the financial markets .weak global economic conditions have reduced our customers 2019 demand for our brokerage products , which have had a negative impact on our operational results .risk solutions generated approximately 60% ( 60 % ) of our consolidated total revenues in 2011 .revenues are generated primarily through fees paid by clients , commissions and fees paid by insurance and reinsurance companies , and investment income on funds held on behalf of clients .our revenues vary from quarter to quarter throughout the year as a result of the timing of our clients 2019 policy renewals , the net effect of new and lost business , the timing of services provided to our clients , and the income we earn on investments , which is heavily influenced by short-term interest rates .we operate in a highly competitive industry and compete with many retail insurance brokerage and agency firms , as well as with individual brokers , agents , and direct writers of insurance coverage .specifically , we address the highly specialized product development and risk management needs of commercial enterprises , professional groups , insurance companies , governments , health care providers , and non-profit groups , among others ; provide affinity products for professional liability , life , disability .

Question: what is the increase observed in the operating margin during 2010 and 2011?
Answer: 0.7%
Explanation: it is the difference between those margins .