Under Armour, Inc. is an American supplier of sportswear and casual apparel. Following are selected financial data for the company for the period 20092013.

	2009		2010		2011		2012		2013
Profit margin (%)	5.6		6.5		6.7		7.1		7.1
Retention ratio (%)	100.0		100.0		100.0		100.0		100.0
Asset turnover (X)	1.6		1.6		1.6		1.6		1.5
Financial leverage (X)	1.7		1.7		1.9		1.8		1.9
Growth rate in sales (%)	18.7		24.8		39.0		25.2		27.7

a. Calculate Under Armours annual sustainable growth rate for the years 2009 through 2013. (Round your answers to 1 decimal place.)