Year	Percent
1998-01-01	66.5607
1999-01-01	45.3527
2000-01-01	56.2000
2001-01-01	55.6000
2002-01-01	50.7968
2003-01-01	71.0787
2004-01-01	60.6153
2005-01-01	55.8898
2006-01-01	75.9556
2007-01-01	74.8090
2008-01-01	77.1906
2009-01-01	52.1036
2010-01-01	73.5526
2011-01-01	74.7660
2012-01-01	75.5589
2013-01-01	80.2466
2014-01-01	75.2682
2015-01-01	75.9674
2016-01-01	79.4553