Year Percent 1991-01-01 0.10399300000000000 1992-01-01 0.09773100000000000 1993-01-01 0.10125000000000000 1994-01-01 0.11059000000000001 1995-01-01 0.11861300000000001 1996-01-01 0.14462600000000000 1997-01-01 0.16812700000000000 1998-01-01 0.17938900000000002 1999-01-01 0.13147700000000000 2000-01-01 0.13020199999999998 2001-01-01 0.14819500000000000 2002-01-01 0.27934000000000003 2003-01-01 0.33304000000000000 2004-01-01 0.40107100000000000 2005-01-01 0.50721500000000000 2006-01-01 0.57930100000000010 2007-01-01 0.63519900000000000 2008-01-01 0.67310600000000010 2009-01-01 0.67142899999999990 2010-01-01 0.73494500000000000 2011-01-01 0.76442700000000010 2012-01-01 0.87883400000000000 2013-01-01 0.91710900000000010 2014-01-01 0.96541599999999990 2015-01-01 1.17275000000000000 2016-01-01 1.35306000000000000