Year Percent 1992-01-01 0.2952290000000000 1993-01-01 0.2902860000000000 1994-01-01 0.2936100000000000 1995-01-01 0.2658810000000000 1996-01-01 0.2536950000000000 1997-01-01 0.2833480000000000 1998-01-01 0.3184430000000000 1999-01-01 0.4844900000000000 2000-01-01 0.5419460000000000 2001-01-01 0.6218170000000000 2002-01-01 0.6364150000000000 2003-01-01 0.6655949999999999 2004-01-01 0.6375370000000000 2005-01-01 0.5899800000000001 2006-01-01 0.6097870000000000 2007-01-01 0.5873200000000000 2008-01-01 0.6766380000000000 2009-01-01 0.7408630000000000 2010-01-01 0.7415609999999999 2011-01-01 0.7390110000000000 2012-01-01 0.7870710000000000 2013-01-01 0.8642540000000001 2014-01-01 0.8985719999999999 2015-01-01 0.8994900000000000