Year	Percent
1999-01-01	3.7838000000000000
2000-01-01	3.9435200000000000
2001-01-01	3.5826599999999997
2002-01-01	3.1578200000000000
2003-01-01	3.8769400000000003
2004-01-01	6.2230600000000000
2005-01-01	3.8866699999999996
2006-01-01	4.0365800000000010
2007-01-01	3.8102099999999997
2008-01-01	4.0085100000000000
2009-01-01	4.0581500000000000
2010-01-01	3.8948300000000002
2011-01-01	3.2653000000000000
2012-01-01	2.8694599999999997
2013-01-01	2.6693100000000000
2014-01-01	2.4735300000000000
2015-01-01	2.7158900000000004
2016-01-01	2.6848500000000000