Year	Percent
1998-01-01	6.6000
1999-01-01	12.6000
2000-01-01	12.5000
2001-01-01	19.8000
2002-01-01	21.3000
2003-01-01	22.4000
2004-01-01	18.7000
2005-01-01	14.8000
2006-01-01	13.0000
2007-01-01	13.2000
2008-01-01	11.1000
2009-01-01	12.6000
2010-01-01	12.7268
2011-01-01	13.4088
2012-01-01	15.7119
2013-01-01	16.4922
2014-01-01	17.3467
2015-01-01	17.7725
2016-01-01	17.9816