Year	Percent
1996-01-01	5.9424100000000000
1997-01-01	6.4138600000000000
1998-01-01	4.7766699999999990
1999-01-01	5.0032500000000000
2000-01-01	4.5178500000000000
2001-01-01	4.1085500000000000
2002-01-01	4.1068000000000000
2003-01-01	4.1627800000000010
2004-01-01	4.3312500000000000
2005-01-01	4.6020900000000005
2006-01-01	4.6165900000000000
2007-01-01	4.5834800000000010
2008-01-01	4.8937500000000000
2009-01-01	5.6017000000000000
2010-01-01	5.8545200000000000
2011-01-01	5.9386500000000000
2012-01-01	5.9176000000000000
2013-01-01	5.7280800000000000
2014-01-01	5.9770500000000000
2015-01-01	8.1742000000000000
2016-01-01	7.8983100000000000