Year	Percent
1996-01-01	38.6093
1997-01-01	38.3226
1998-01-01	32.0157
1999-01-01	30.1963
2000-01-01	34.9007
2001-01-01	33.9240
2002-01-01	30.5162
2003-01-01	20.5873
2004-01-01	28.8866
2005-01-01	29.8573
2006-01-01	27.9800
2007-01-01	45.0793
2008-01-01	19.6169
2009-01-01	25.5983
2010-01-01	20.0374
2011-01-01	16.9230
2012-01-01	19.4982
2013-01-01	18.3460
2014-01-01	17.6435
2015-01-01	18.9400
2016-01-01	19.9064