Year	Percent
1996-01-01	3.6226800000000003
1997-01-01	3.2351600000000000
1998-01-01	4.0625800000000005
1999-01-01	3.0501500000000000
2000-01-01	2.8849600000000000
2001-01-01	2.9533600000000000
2002-01-01	3.0563599999999997
2003-01-01	2.9724200000000000
2004-01-01	3.1358599999999996
2005-01-01	2.6172700000000000
2006-01-01	3.0057099999999997
2007-01-01	3.2834300000000000
2008-01-01	2.8382099999999997
2009-01-01	3.3183300000000004
2010-01-01	2.9779500000000000
2011-01-01	2.9582599999999997
2012-01-01	2.9243400000000000
2013-01-01	2.6018600000000000
2014-01-01	2.4131900000000000
2015-01-01	2.3123400000000003
2016-01-01	2.2536900000000000