Year	Percent
1997-01-01	5.03076
1998-01-01	2.38266
1999-01-01	2.85612
2000-01-01	4.23755
2001-01-01	4.60805
2002-01-01	5.42000
2003-01-01	4.61000
2004-01-01	5.07000
2005-01-01	8.36000
2006-01-01	10.59000
2007-01-01	12.66000
2008-01-01	9.48000
2009-01-01	11.79000
2010-01-01	13.89000
2011-01-01	11.67000
2012-01-01	12.05000
2013-01-01	15.47000
2014-01-01	17.05000
2015-01-01	17.37000
2016-01-01	17.18000