Year	Percent
1998-01-01	52.232100000000000
1999-01-01	48.590200000000000
2000-01-01	66.000000000000000
2001-01-01	55.300000000000000
2002-01-01	37.378100000000000
2003-01-01	41.013000000000005
2004-01-01	50.644000000000000
2005-01-01	50.430000000000000
2006-01-01	58.693400000000000
2007-01-01	57.106300000000000
2008-01-01	63.706200000000000
2009-01-01	49.518200000000000
2010-01-01	51.224900000000000
2011-01-01	49.201600000000000
2012-01-01	50.552600000000000
2013-01-01	54.577500000000000
2014-01-01	55.301100000000000
2015-01-01	54.882300000000000