Year	Percent
2000-01-01	47.9373823449931
2001-01-01	47.1483625945876
2002-01-01	46.4497249405336
2003-01-01	47.0011128299177
2004-01-01	45.7388612555635
2005-01-01	45.4584082439690
2006-01-01	45.0791966711788
2007-01-01	45.0818071788320
2008-01-01	45.1708335261111
2009-01-01	45.9938987920408
2010-01-01	45.4555101854426
2011-01-01	45.1072237141556
2012-01-01	44.7641039911969
2013-01-01	44.3699834269761
2014-01-01	42.9335320428850
2015-01-01	42.1492181401634
2016-01-01	41.7002059635504
2017-01-01	41.0004053916607