Year	Percent
1992-01-01	87.4907
1993-01-01	83.8498
1994-01-01	68.9265
1995-01-01	71.8903
1996-01-01	81.8175
1997-01-01	83.3748
1998-01-01	64.7848
1999-01-01	50.5242
2000-01-01	48.7373
2001-01-01	51.5896
2002-01-01	64.4183
2003-01-01	81.1667
2004-01-01	85.8968
2005-01-01	89.6876
2006-01-01	93.0112
2007-01-01	95.5856
2008-01-01	97.2550
2009-01-01	96.4723
2010-01-01	90.4437
2011-01-01	84.4062
2012-01-01	83.3478
2013-01-01	84.8836
2014-01-01	87.0880
2015-01-01	86.0801
2016-01-01	85.2577