Year	Percent
1998-01-01	12.7000
1999-01-01	20.6000
2000-01-01	21.3000
2001-01-01	18.5000
2002-01-01	17.4000
2003-01-01	16.5000
2004-01-01	16.0000
2005-01-01	15.2000
2006-01-01	14.0000
2007-01-01	16.3000
2008-01-01	15.1000
2009-01-01	16.4000
2010-01-01	18.7892
2011-01-01	20.4697
2012-01-01	20.8944
2013-01-01	20.8700
2014-01-01	21.8000
2015-01-01	20.9800
2016-01-01	22.5300