Year	Percent
1996-01-01	20.8794
1997-01-01	27.2211
1998-01-01	35.0797
1999-01-01	29.3459
2000-01-01	28.2165
2001-01-01	36.4965
2002-01-01	28.6232
2003-01-01	24.7745
2004-01-01	26.0096
2005-01-01	28.5822
2006-01-01	15.6816
2007-01-01	18.9671
2008-01-01	37.6147
2009-01-01	21.1105
2010-01-01	25.8227
2011-01-01	30.3901
2012-01-01	22.8841
2013-01-01	19.3036
2014-01-01	23.3064
2015-01-01	25.4799
2016-01-01	24.2156