Year	Percent
1991-01-01	96.8646
1992-01-01	86.0740
1993-01-01	60.1775
1994-01-01	68.6206
1995-01-01	71.6123
1996-01-01	73.1893
1997-01-01	76.2293
1998-01-01	65.0124
1999-01-01	52.7815
2000-01-01	55.9863
2001-01-01	63.2736
2002-01-01	67.9640
2003-01-01	72.6655
2004-01-01	75.2095
2005-01-01	77.6585
2006-01-01	82.6496
2007-01-01	87.8045
2008-01-01	90.7623
2009-01-01	91.6015
2010-01-01	92.0847
2011-01-01	92.9063
2012-01-01	94.2247
2013-01-01	95.3207
2014-01-01	95.5865
2015-01-01	95.5150
2016-01-01	83.4844