Using the data in the following table, and the fact that the correlation of A and B is 0.59, calculate the volatility (standard deviation) of a portfolio that is 60% invested in stock A and 40% invested in stock B.

	Realized Returns
Year	Stock A		Stock B
2008	7%		13%
2009	19%		33%
2010	4%		4%
2011	6%		7%
2012	4%		11%
2013	5%		28%

The standard deviation of the portfolio is________%.(Round to two decimal places.)