Year Percent 2003-01-01 0.247480 2004-01-01 0.197389 2005-01-01 0.184847 2006-01-01 0.261815 2007-01-01 0.560883 2008-01-01 0.892337 2009-01-01 0.645552 2010-01-01 0.275240 2011-01-01 0.441483 2012-01-01 0.435112