Year	Percent
1996-01-01	57.7546
1997-01-01	56.8081
1998-01-01	57.8801
1999-01-01	57.2130
2000-01-01	58.4391
2001-01-01	60.8015
2002-01-01	59.5488
2003-01-01	59.8312
2004-01-01	57.9743
2005-01-01	58.3414
2006-01-01	59.3365
2007-01-01	53.9295
2008-01-01	58.3189
2009-01-01	58.0749
2010-01-01	59.6233
2011-01-01	59.4374
2012-01-01	58.1638
2013-01-01	57.3202
2014-01-01	60.1489
2015-01-01	55.8673
2016-01-01	64.0831