Year	Percent
1996-01-01	31.4495
1997-01-01	36.7130
1998-01-01	47.2801
1999-01-01	51.4502
2000-01-01	53.0181
2001-01-01	64.7608
2002-01-01	70.7363
2003-01-01	79.5237
2004-01-01	82.1437
2005-01-01	86.8497
2006-01-01	80.6743
2007-01-01	74.3455
2008-01-01	78.0658
2009-01-01	81.0380
2010-01-01	60.0055
2011-01-01	58.0151
2012-01-01	58.6973
2013-01-01	59.7569
2014-01-01	60.9200
2015-01-01	60.8175
2016-01-01	61.0496