Under Armour, Incorporated is an American supplier of sportswear and casual apparel. Following are selected financial data for the company for the period 2009 to 2013. Profit margin (%) Retention ratio (%) Asset turnover (X) Financial leverage (X) Growth rate in sales (%) 2009 2010 2011 2012 2013 5.5 6.4 6.6 7.0 7.0 100.0 100.0 100.0 100.0 100.0 1.7 1.7 1.7 1.7 1.6 1.8 1.8 2.0 1.9 2.0 19.1 25.2 39.4 25.6 28.1 a. Calculate Under Armour's annual sustainable growth rate for the years 2009 through 2013. Note: Round your answers to 1 decimal place. Year Sustainable Growth Rate 2009 % 2010 % 2011 % 2012 % 2013 %