Year	Percent
1980-01-01	64.4328
1981-01-01	67.1928
1982-01-01	71.5341
1983-01-01	77.1197
1984-01-01	86.0739
1985-01-01	91.4668
1986-01-01	89.6562
1987-01-01	87.3134
1988-01-01	87.9516
1989-01-01	90.0590
1990-01-01	92.4134
1991-01-01	94.2741
1992-01-01	94.8512
1993-01-01	94.7159
1994-01-01	95.6850
1995-01-01	97.3188
1996-01-01	98.3676
1997-01-01	98.5953
1998-01-01	96.4407
1999-01-01	78.6957
2000-01-01	71.3999
2001-01-01	72.8508
2002-01-01	69.8292
2003-01-01	70.8827
2004-01-01	73.6413
2005-01-01	75.4228
2006-01-01	77.4237
2007-01-01	80.3744
2008-01-01	83.6017
2009-01-01	85.3238
2010-01-01	86.5862
2011-01-01	87.6629
2012-01-01	88.6903
2013-01-01	90.1386
2014-01-01	91.1986
2015-01-01	91.9994
2016-01-01	92.7693