Year	Percent
1998-01-01	40.700000000000000
1999-01-01	41.100000000000000
2000-01-01	34.900000000000000
2001-01-01	31.500000000000000
2002-01-01	28.100000000000000
2003-01-01	22.100000000000000
2004-01-01	17.500000000000000
2005-01-01	17.500000000000000
2006-01-01	17.500000000000000
2007-01-01	17.500000000000000
2008-01-01	17.500000000000000
2009-01-01	17.500000000000000
2010-01-01	17.500000000000000
2011-01-01	5.849000000000000
2012-01-01	9.728080000000000
2013-01-01	8.641850000000000
2014-01-01	9.365540000000000
2015-01-01	8.397910000000001