Year	Percent
1996-01-01	72.4886
1997-01-01	67.9039
1998-01-01	78.4722
1999-01-01	83.0784
2000-01-01	81.4057
2001-01-01	79.4411
2002-01-01	82.9894
2003-01-01	81.6127
2004-01-01	80.4020
2005-01-01	76.4723
2006-01-01	79.9546
2007-01-01	79.4446
2008-01-01	73.4224
2009-01-01	72.1706
2010-01-01	72.6281
2011-01-01	71.8250
2012-01-01	69.7012
2013-01-01	68.5797
2014-01-01	69.3836
2015-01-01	66.2466
2016-01-01	71.7766