You have the following historical annual total returns on Terlingua Oil & Gas Exploration: Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Annual total return (96) -4% 0% 16% 6% 13% 10% -4% -9% 0% 996 Calculate the sample standard deviation of annual return Do not round at Intermediate steps in your calculation. Express your answer in percent. Round to two decimal places. Do not type the symbol