Year	Percent
1984-01-01	49.317300000000000
1985-01-01	51.847700000000000
1986-01-01	59.588900000000000
1987-01-01	61.509400000000000
1988-01-01	69.164400000000000
1989-01-01	70.761400000000000
1990-01-01	71.917900000000000
1991-01-01	73.025000000000000
1992-01-01	70.132200000000000
1993-01-01	70.306500000000000
1994-01-01	68.168500000000000
1995-01-01	70.361000000000000
1996-01-01	70.020500000000000
1997-01-01	64.660900000000000
1998-01-01	60.464200000000000
1999-01-01	53.725600000000000
2000-01-01	53.083999999999996
2001-01-01	53.278100000000000
2002-01-01	57.236600000000000
2003-01-01	63.702500000000000
2004-01-01	69.832100000000000
2005-01-01	73.746200000000000
2006-01-01	75.675300000000000
2007-01-01	74.794100000000000
2008-01-01	76.068100000000000
2009-01-01	84.525000000000000
2010-01-01	90.798600000000000
2011-01-01	83.355000000000000
2012-01-01	79.591000000000010
2013-01-01	83.151800000000000
2014-01-01	80.463200000000000
2015-01-01	82.256800000000000
2016-01-01	87.226400000000000