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 $2013.$

$\backslash$table$[[$Profit margin $(\%),2009,2010,2011,2012,2013],[$Retention ratio $(\%),5\mathrm{.}4,6\mathrm{.}3,6\mathrm{.}5,6\mathrm{.}9,6\mathrm{.}9],[$Asset turnover $($X$),100\mathrm{.}0,100\mathrm{.}0,100\mathrm{.}0,100\mathrm{.}0,100\mathrm{.}0],[$Financial leverage $($X$),1\mathrm{.}5,1\mathrm{.}5,1\mathrm{.}5,1\mathrm{.}5,1\mathrm{.}4],[$Growth rate in sales $(\%),1\mathrm{.}6,1\mathrm{.}6,1\mathrm{.}8,1\mathrm{.}7,1\mathrm{.}8],[,19\mathrm{.}2,25\mathrm{.}3,39\mathrm{.}5,25\mathrm{.}7,28\mathrm{.}2]]$

a$.$ Calculate Under Armour's annual sustainable growth rate for the years $2009$ through $2013.$ Note: Round your answers to $1$ decimal place.

$\backslash$table$[[$Year$,$Sustainable Growth Rate$],[2009,,\%$