Year	Percent
1999-01-01	33.333300000000000
2000-01-01	38.888900000000000
2001-01-01	26.923100000000000
2002-01-01	7.692310000000001
2003-01-01	19.354800000000000
2004-01-01	20.339000000000002
2005-01-01	23.728800000000000
2006-01-01	26.153800000000000
2007-01-01	34.146300000000000
2008-01-01	38.738700000000000
2009-01-01	37.894700000000000
2010-01-01	39.393900000000000
2011-01-01	40.217400000000000
2012-01-01	36.956500000000000
2013-01-01	36.734700000000000
2014-01-01	40.594100000000000