What are standard deviations of stock X and stock Y respectively?

Year End 2004 2005 2006 2007 2008 2009 Stock X Realized Return 20.1% 72.7% -25.7% 56.9% 6.7% 17.9% Stock Y Realized Return -14.6% 4.3% -58.1% 71.1% 17.3% 0.9% Stock Z Realized Return 0.2% -3.2% -27.0% 27.9% -5.1% -11.3%