Year Percent 1993-01-01 0.29010300000000000 1994-01-01 0.23603800000000000 1995-01-01 0.31784700000000000 1996-01-01 0.24099500000000000 1997-01-01 0.17613399999999999 1998-01-01 0.18644900000000000 1999-01-01 0.15439100000000000 2000-01-01 0.07842200000000000 2001-01-01 0.06780100000000000 2002-01-01 0.07213000000000000 2003-01-01 0.07858300000000000 2004-01-01 0.08221300000000000 2005-01-01 0.11777300000000000 2006-01-01 0.15963800000000000 2007-01-01 0.30537900000000000 2008-01-01 0.21020900000000000 2009-01-01 0.27385800000000000 2010-01-01 0.33800500000000000 2011-01-01 0.29174300000000000 2012-01-01 0.27848700000000000 2013-01-01 0.29271500000000000 2014-01-01 0.34815799999999997 2015-01-01 0.30774900000000000 2016-01-01 0.38452900000000000