Year	Percent
1999-01-01	18.3550000000000000
2000-01-01	15.6014000000000000
2001-01-01	15.0796000000000000
2002-01-01	17.0378000000000000
2003-01-01	15.5278000000000000
2004-01-01	11.6514000000000000
2005-01-01	10.6790000000000000
2006-01-01	9.7820300000000000
2007-01-01	8.9585000000000000
2008-01-01	10.5631000000000000
2009-01-01	9.9217400000000000
2010-01-01	9.0843300000000000
2011-01-01	9.3280600000000000
2012-01-01	9.0495500000000000
2013-01-01	8.3025500000000000
2014-01-01	8.1381300000000000
2015-01-01	7.5029699999999995
2016-01-01	6.5559100000000010