Year	Percent
1998-01-01	61.482500000000000
1999-01-01	61.306600000000000
2000-01-01	54.600000000000000
2001-01-01	56.200000000000000
2002-01-01	49.858700000000000
2003-01-01	51.877800000000000
2004-01-01	54.227900000000000
2005-01-01	52.419800000000000
2006-01-01	60.697100000000000
2007-01-01	59.456500000000000
2008-01-01	36.289300000000000
2009-01-01	43.638800000000000
2010-01-01	47.758800000000000
2011-01-01	45.533100000000000
2012-01-01	46.277900000000000
2013-01-01	49.291000000000004
2014-01-01	40.791300000000000
2015-01-01	36.717100000000000
2016-01-01	49.752900000000000