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NEW YORK ( TheStreet) -- The ex-dividend date for Aetna (NYSE: AET) is tomorrow, April 10, 2012. Owners of shares as of market close today will be eligible for a dividend of 18 cents per share. At a price of $48.89 as of 9:30 a.m. ET, the dividend yield is 1.4%. The average volume for Aetna has been 3.4 million shares per day over the past 30 days. Aetna has a market cap of $15.5 billion and is part of the health care sector and health services industry. Shares are up 17.6% year to date as of the close of trading on Thursday. Aetna Inc. operates as a diversified health care benefits company in the United States. The company operates in three segments: Health Care, Group Insurance, and Large Case Pensions. The company has a P/E ratio of 9.5, above the average health services industry P/E ratio of nine and below the S&P 500 P/E ratio of 17.7.