Year	Percent
1991-01-01	65.4214833038924
1992-01-01	65.3904451565757
1993-01-01	65.2579187171209
1994-01-01	65.1911486710167
1995-01-01	65.1462531569327
1996-01-01	65.0881474573912
1997-01-01	64.9990778811436
1998-01-01	64.9124344077949
1999-01-01	64.8959076016242
2000-01-01	64.8780766994750
2001-01-01	64.9478882591373
2002-01-01	65.0051479967917
2003-01-01	64.8856419698590
2004-01-01	64.7979381438428
2005-01-01	64.9197245961869
2006-01-01	64.9579367941430
2007-01-01	64.9241480355402
2008-01-01	64.8908801896438
2009-01-01	64.8364595498222
2010-01-01	64.9459201557758
2011-01-01	64.9633973840896
2012-01-01	64.9678847462727
2013-01-01	64.9015090548068
2014-01-01	64.8464806448310
2015-01-01	64.7648515123028
2016-01-01	64.7141926011310
2017-01-01	64.7486894465063