Under Armour, Inc. is an American supplier of sportswear and casual apparel. Following are selected financial data for the company for the period 2009-2013. Profit margin (%) Retention ratio (%) Asset turnover (X) Financial leverage (X) Growth rate in sales (%) 2009 5.5 2010 2011 2012 2013 100.0 6.4 100.0 6.6 7.0 7.0 100.0 100.0 100.0 1.6 1.6 1.6 1.6 1.5 1.7 1.7 1.9 1.8 1.9 18.1 24.2 38.4 24.6 27.1 a. Calculate Under Armour's annual sustainable growth rate for the years 2009 through 2013. (Round your answers to 1 decimal place.) Year Sustainable Growth Rate 2009 % 2010 % 2011 % 2012 % 2013 %