Year	Percent
1998-01-01	84.4000
1999-01-01	78.7000
2000-01-01	79.9000
2001-01-01	71.9000
2002-01-01	68.0000
2003-01-01	60.6000
2004-01-01	62.3000
2005-01-01	60.0000
2006-01-01	56.8000
2007-01-01	54.4000
2008-01-01	48.7000
2009-01-01	42.8000
2010-01-01	38.7988
2011-01-01	41.3296
2012-01-01	42.5429
2013-01-01	46.3299
2014-01-01	50.9629
2015-01-01	61.9141
2016-01-01	70.1322