Year	Percent
1996-01-01	18.6842
1997-01-01	19.1244
1998-01-01	16.5618
1999-01-01	16.1017
2000-01-01	16.9014
2001-01-01	18.5654
2002-01-01	20.9052
2003-01-01	22.6216
2004-01-01	28.3547
2005-01-01	24.5837
2006-01-01	28.4124
2007-01-01	32.6300
2008-01-01	34.1974
2009-01-01	39.9079
2010-01-01	41.7256
2011-01-01	39.1682
2012-01-01	37.0706
2013-01-01	30.0823
2014-01-01	27.2234