Year	Percent
2000-01-01	37.26
2001-01-01	35.65
2002-01-01	32.55
2003-01-01	35.55
2004-01-01	35.82
2005-01-01	40.18
2006-01-01	41.11
2007-01-01	40.36
2008-01-01	34.37
2009-01-01	39.86
2010-01-01	42.19
2011-01-01	40.36
2012-01-01	45.74
2013-01-01	48.41
2014-01-01	53.04
2015-01-01	55.70
2016-01-01	59.14