Year	Percent
1974-01-01	98.39740000000000
1975-01-01	98.40340000000000
1976-01-01	98.15780000000000
1977-01-01	97.90350000000000
1978-01-01	91.87920000000000
1979-01-01	92.79320000000000
1980-01-01	98.07430000000000
1981-01-01	97.78860000000000
1982-01-01	97.38080000000000
1983-01-01	97.30190000000000
1984-01-01	97.45700000000001
1985-01-01	96.66799999999999
1986-01-01	93.40810000000000
1987-01-01	94.42060000000000
1988-01-01	98.14830000000000
1989-01-01	98.38330000000000
1990-01-01	98.48260000000000
1991-01-01	98.56750000000000
1992-01-01	98.59910000000000
1993-01-01	98.72590000000000
1994-01-01	96.76480000000000
1995-01-01	95.74680000000000
1996-01-01	97.67160000000000
1997-01-01	98.77090000000000
1998-01-01	98.93430000000000
1999-01-01	98.90680000000000
2000-01-01	98.81890000000000
2001-01-01	98.82160000000000
2002-01-01	97.43060000000000
2003-01-01	96.38020000000000
2004-01-01	96.46810000000000
2005-01-01	96.90630000000000
2006-01-01	97.85370000000000
2007-01-01	99.02240000000000
2008-01-01	99.71320000000000
2009-01-01	99.82580000000000
2010-01-01	99.75120000000000
2011-01-01	95.46720000000000
2012-01-01	95.46270000000000
2013-01-01	99.26960000000000
2014-01-01	99.58670000000000
2015-01-01	99.81500000000000
2016-01-01	95.96150000000000