Year	Percent
1996-01-01	61.9586
1997-01-01	69.9888
1998-01-01	51.4522
1999-01-01	53.3471
2000-01-01	53.4603
2001-01-01	49.8181
2002-01-01	45.5624
2003-01-01	44.2425
2004-01-01	48.4744
2005-01-01	41.1977
2006-01-01	41.1502
2007-01-01	43.0950
2008-01-01	43.4123
2009-01-01	51.7618
2010-01-01	51.2898
2011-01-01	50.8833
2012-01-01	47.1684
2013-01-01	45.5008
2014-01-01	44.3319
2015-01-01	40.7591
2016-01-01	34.3357