Year Percent 1995-01-01 0.0000 1996-01-01 0.0000 1997-01-01 0.0000 1998-01-01 0.0000 1999-01-01 0.0000 2000-01-01 0.0000 2001-01-01 0.0000 2002-01-01 14.2280 2003-01-01 12.6510 2004-01-01 13.5953 2005-01-01 12.1222 2006-01-01 14.8563 2007-01-01 16.5439 2008-01-01 15.4672 2009-01-01 15.6406 2010-01-01 14.1730 2011-01-01 11.9608 2012-01-01 0.0000 2013-01-01 0.0000