Year	Percent
1996-01-01	3.0320400000000003
1997-01-01	2.8587500000000000
1998-01-01	2.2772099999999997
1999-01-01	2.3449100000000000
2000-01-01	2.3129400000000000
2001-01-01	2.3050800000000000
2002-01-01	2.5198900000000000
2003-01-01	2.6412100000000000
2004-01-01	2.5719500000000000
2005-01-01	2.3804200000000000
2006-01-01	2.2240599999999997
2007-01-01	2.1073700000000000
2008-01-01	1.8190600000000000
2009-01-01	1.6460200000000000
2010-01-01	1.8974600000000000
2011-01-01	1.9258600000000000
2012-01-01	1.9395200000000001
2013-01-01	1.8983500000000000
2014-01-01	1.8372900000000000
2015-01-01	1.7159700000000000
2016-01-01	1.6355899999999999