Year	Percent
1996-01-01	97.2552
1997-01-01	99.9025
1998-01-01	99.1853
1999-01-01	98.9130
2000-01-01	98.7409
2001-01-01	97.5859
2002-01-01	98.1026
2003-01-01	98.3368
2004-01-01	98.8131
2005-01-01	98.5086
2006-01-01	98.1647
2007-01-01	98.4907
2008-01-01	98.4852
2009-01-01	97.8624
2010-01-01	97.4479
2011-01-01	97.1800
2012-01-01	95.8870
2013-01-01	95.1044
2014-01-01	95.0856
2015-01-01	94.1170
2016-01-01	94.9537