Year	Percent
1996-01-01	74.3369
1997-01-01	64.8793
1998-01-01	56.1809
1999-01-01	62.4723
2000-01-01	63.8197
2001-01-01	63.0926
2002-01-01	67.6391
2003-01-01	73.8385
2004-01-01	71.7866
2005-01-01	71.1758
2006-01-01	69.2465
2007-01-01	71.9285
2008-01-01	69.9896
2009-01-01	77.0572
2010-01-01	75.5349
2011-01-01	79.1188
2012-01-01	79.3075
2013-01-01	67.9680
2014-01-01	68.7916
2015-01-01	67.3893
2016-01-01	66.1737