Year	Percent
1998-01-01	43.5448
1999-01-01	40.0271
2000-01-01	44.8000
2001-01-01	43.9000
2002-01-01	48.1613
2003-01-01	44.5785
2004-01-01	46.6837
2005-01-01	49.1646
2006-01-01	51.2824
2007-01-01	47.1688
2008-01-01	44.0348
2009-01-01	49.5797
2010-01-01	53.2539
2011-01-01	55.0887
2012-01-01	57.4495
2013-01-01	49.2564
2014-01-01	47.1963
2015-01-01	60.8500
2016-01-01	60.4733