Year	Percent
1996-01-01	91.3816
1997-01-01	90.9767
1998-01-01	90.0440
1999-01-01	90.5827
2000-01-01	91.3413
2001-01-01	89.5448
2002-01-01	87.0065
2003-01-01	88.8768
2004-01-01	88.1931
2005-01-01	88.5598
2006-01-01	91.6897
2007-01-01	89.6986
2008-01-01	86.2069
2009-01-01	88.3569
2010-01-01	93.9364
2011-01-01	98.5528
2012-01-01	94.8095
2013-01-01	91.6664
2014-01-01	91.4191
2015-01-01	89.0088
2016-01-01	88.8612