Year	Percent
1980-01-01	94.5697
1981-01-01	94.0002
1982-01-01	94.7083
1983-01-01	93.5420
1984-01-01	91.4977
1985-01-01	90.2781
1986-01-01	90.2843
1987-01-01	90.8137
1988-01-01	90.3869
1989-01-01	88.7640
1990-01-01	90.7248
1991-01-01	90.0029
1992-01-01	80.3277
1993-01-01	76.0584
1994-01-01	77.4670
1995-01-01	83.6190
1996-01-01	90.2269
1997-01-01	90.7533
1998-01-01	91.0850
1999-01-01	92.1531
2000-01-01	93.2440
2001-01-01	94.1965
2002-01-01	96.7441
2003-01-01	99.2258
2004-01-01	99.9237
2005-01-01	99.9374
2006-01-01	99.9593
2007-01-01	99.9821
2008-01-01	99.9886
2009-01-01	99.9935
2010-01-01	99.9969
2011-01-01	99.9972
2012-01-01	99.9974
2013-01-01	99.9975
2014-01-01	99.9978
2015-01-01	99.9981
2016-01-01	99.9983