Year	Percent
1982-01-01	85.4727
1983-01-01	85.8517
1984-01-01	86.8623
1985-01-01	83.0165
1986-01-01	77.0876
1987-01-01	78.6274
1988-01-01	80.5524
1989-01-01	79.6919
1990-01-01	80.9730
1991-01-01	81.3264
1992-01-01	79.7440
1993-01-01	78.4949
1994-01-01	71.1242
1995-01-01	71.8281
1996-01-01	66.6324
1997-01-01	68.4852
1998-01-01	67.8649
1999-01-01	70.3234
2000-01-01	70.8594
2001-01-01	72.0534
2002-01-01	72.0577
2003-01-01	74.4994
2004-01-01	77.3120
2005-01-01	75.9695
2006-01-01	73.0358
2007-01-01	72.4883
2008-01-01	74.2763
2009-01-01	75.6871
2010-01-01	76.5317
2011-01-01	75.6352
2012-01-01	75.9942
2013-01-01	77.2027
2014-01-01	78.0043
2015-01-01	82.1536
2016-01-01	83.6148