Year	Percent
1999-01-01	23.1562
2000-01-01	23.0547
2001-01-01	20.2949
2002-01-01	17.3947
2003-01-01	20.5962
2004-01-01	23.3311
2005-01-01	20.1176
2006-01-01	25.5886
2007-01-01	28.0963
2008-01-01	14.4818
2009-01-01	21.3945
2010-01-01	16.8965
2011-01-01	14.1106
2012-01-01	17.6746
2013-01-01	24.5242
2014-01-01	24.0147
2015-01-01	25.5832
2016-01-01	24.8015