Year	Percent
2000-01-01	29.4028512646348
2001-01-01	30.1818512263665
2002-01-01	31.5690105361949
2003-01-01	31.0352782987006
2004-01-01	31.4938301654952
2005-01-01	30.4840402017042
2006-01-01	27.9803983887774
2007-01-01	26.2174453174606
2008-01-01	23.6592667523268
2009-01-01	22.4761423721971
2010-01-01	22.6765252939090
2011-01-01	23.1923881303468
2012-01-01	24.1073855235186
2013-01-01	23.9339923824035
2014-01-01	25.5988495084293
2015-01-01	26.7286382330186
2016-01-01	26.9366749701604
2017-01-01	27.1593973285909