Year	Percent
1998-01-01	11.2899
1999-01-01	10.5617
2000-01-01	10.0072
2001-01-01	12.0698
2002-01-01	12.1433
2003-01-01	10.4899
2004-01-01	11.8006
2005-01-01	14.3269
2006-01-01	13.5517
2007-01-01	18.5168
2008-01-01	23.6345
2009-01-01	22.2228
2010-01-01	16.0535
2011-01-01	13.5680
2012-01-01	13.3701
2013-01-01	14.7643
2014-01-01	17.9851
2015-01-01	20.4669
2016-01-01	18.8068