Year	Percent
1996-01-01	71.9209
1997-01-01	77.7025
1998-01-01	83.1891
1999-01-01	90.0742
2000-01-01	89.0878
2001-01-01	89.8761
2002-01-01	88.8670
2003-01-01	87.7430
2004-01-01	92.1804
2005-01-01	95.4341
2006-01-01	98.0006
2007-01-01	98.5843
2008-01-01	97.6327
2009-01-01	91.5784
2010-01-01	78.5262
2011-01-01	77.7216
2012-01-01	76.5139
2013-01-01	76.2401
2014-01-01	77.4424
2015-01-01	67.3846
2016-01-01	64.3804