Year	Percent
1998-01-01	32.900000000000000
1999-01-01	41.300000000000000
2000-01-01	41.300000000000000
2001-01-01	41.300000000000000
2002-01-01	23.100000000000000
2003-01-01	22.400000000000000
2004-01-01	17.000000000000000
2005-01-01	15.000000000000000
2006-01-01	11.200000000000000
2007-01-01	7.500000000000000
2008-01-01	6.700000000000000
2009-01-01	8.900000000000000
2010-01-01	9.040710000000000
2011-01-01	9.522689999999999
2012-01-01	10.112400000000000
2013-01-01	10.939600000000000
2014-01-01	10.805900000000000
2015-01-01	10.314500000000000
2016-01-01	6.286610000000000