Year	Percent
1999-01-01	5.16134
2000-01-01	5.05351
2001-01-01	3.34000
2002-01-01	3.38000
2003-01-01	3.54000
2004-01-01	3.78000
2005-01-01	4.14000
2006-01-01	4.21000
2007-01-01	4.60000
2008-01-01	4.65000
2009-01-01	5.30000
2010-01-01	5.43000
2011-01-01	5.52000
2012-01-01	6.08000
2013-01-01	6.08000
2014-01-01	6.63000
2015-01-01	6.59000
2016-01-01	6.76000