Year Percent 1993-01-01 1.172460000000000 1994-01-01 4.667330000000001 1995-01-01 8.285120000000000 1996-01-01 9.522940000000000 1997-01-01 9.372580000000001 1998-01-01 11.307800000000000 1999-01-01 10.943200000000000 2000-01-01 8.440980000000000 2001-01-01 8.230920000000000 2002-01-01 12.752500000000000 2003-01-01 13.138800000000000 2004-01-01 13.256800000000000 2005-01-01 16.051500000000000 2006-01-01 18.254100000000000 2007-01-01 20.921700000000000 2008-01-01 21.033600000000000 2009-01-01 29.738900000000000 2010-01-01 28.575300000000000 2011-01-01 27.983600000000000 2012-01-01 29.470700000000000 2013-01-01 28.344900000000000 2014-01-01 29.136100000000000 2015-01-01 28.921200000000000 2016-01-01 37.657400000000000