Year	Percent
1998-01-01	34.193800000000000
1999-01-01	34.609600000000000
2000-01-01	38.200000000000000
2001-01-01	40.200000000000000
2002-01-01	39.852000000000000
2003-01-01	40.548400000000000
2004-01-01	43.968999999999994
2005-01-01	40.060000000000000
2006-01-01	42.433700000000000
2007-01-01	50.114500000000000
2008-01-01	42.963800000000000
2009-01-01	44.788200000000000
2010-01-01	44.788200000000000
2011-01-01	44.788200000000000
2012-01-01	52.549500000000000
2013-01-01	55.086100000000000
2014-01-01	56.930100000000000
2015-01-01	56.603600000000000
2016-01-01	54.121600000000000