Year	Percent
1996-01-01	59.7699
1997-01-01	63.3463
1998-01-01	71.2082
1999-01-01	85.5133
2000-01-01	79.8809
2001-01-01	69.4336
2002-01-01	68.1027
2003-01-01	62.9770
2004-01-01	59.1651
2005-01-01	58.8562
2006-01-01	58.6670
2007-01-01	67.4691
2008-01-01	69.6552
2009-01-01	53.4014
2010-01-01	55.4837
2011-01-01	62.2731
2012-01-01	78.8870
2013-01-01	78.5351
2014-01-01	73.7136