Year	Percent
1998-01-01	50.3000
1999-01-01	45.4000
2000-01-01	42.8000
2001-01-01	44.0000
2002-01-01	41.1000
2003-01-01	43.5000
2004-01-01	47.7000
2005-01-01	49.3000
2006-01-01	51.9000
2007-01-01	41.8000
2008-01-01	32.1000
2009-01-01	26.9000
2010-01-01	25.4656
2011-01-01	30.1286
2012-01-01	22.2720
2013-01-01	16.2985
2014-01-01	17.4551
2015-01-01	17.3056
2016-01-01	16.6707