Year	Percent
1996-01-01	56.0963
1997-01-01	52.9594
1998-01-01	53.2359
1999-01-01	57.4426
2000-01-01	50.8005
2001-01-01	52.6777
2002-01-01	57.9664
2003-01-01	57.4428
2004-01-01	53.4480
2005-01-01	47.4655
2006-01-01	48.7831
2007-01-01	45.4535
2008-01-01	31.7985
2009-01-01	33.6128
2010-01-01	35.3652
2011-01-01	33.1199
2012-01-01	32.7599
2013-01-01	29.8517
2014-01-01	29.8667
2015-01-01	28.5532
2016-01-01	26.9353