Year	Percent
1998-01-01	3.6000000000000000
1999-01-01	5.8000000000000000
2000-01-01	7.8000000000000000
2001-01-01	10.0000000000000000
2002-01-01	12.4000000000000000
2003-01-01	12.4000000000000000
2004-01-01	17.7000000000000000
2005-01-01	16.4000000000000000
2006-01-01	13.5000000000000000
2007-01-01	10.1000000000000000
2008-01-01	7.5000000000000000
2009-01-01	6.0000000000000000
2010-01-01	4.3000000000000000
2011-01-01	3.7569300000000000
2012-01-01	3.7869800000000002
2013-01-01	3.9655300000000000
2014-01-01	4.0080400000000000
2015-01-01	4.1952900000000000
2016-01-01	4.8790800000000000