Year	Percent
1965-01-01	99.10580000000000
1966-01-01	97.07090000000000
1967-01-01	97.33140000000000
1968-01-01	97.24230000000000
1969-01-01	97.11420000000000
1970-01-01	97.23460000000000
1971-01-01	98.54070000000000
1972-01-01	99.85820000000000
1973-01-01	99.85820000000000
1974-01-01	99.85820000000000
1975-01-01	99.85820000000000
1976-01-01	99.85820000000000
1977-01-01	99.85820000000000
1978-01-01	99.85820000000000
1979-01-01	99.85820000000000
1980-01-01	99.85820000000000
1981-01-01	99.85820000000000
1982-01-01	99.85820000000000
1983-01-01	99.85820000000000
1984-01-01	99.85820000000000
1985-01-01	99.85820000000000
1986-01-01	99.85820000000000
1987-01-01	99.85820000000000
1988-01-01	99.85820000000000
1989-01-01	99.85820000000000
1990-01-01	99.85820000000000
1991-01-01	99.85820000000000
1992-01-01	99.85820000000000
1993-01-01	99.85820000000000
1994-01-01	99.85820000000000
1995-01-01	99.85820000000000
1996-01-01	99.85820000000000
1997-01-01	99.85820000000000
1998-01-01	99.85820000000000
1999-01-01	99.85820000000000
2000-01-01	98.62930000000000
2001-01-01	97.32440000000000
2002-01-01	97.31600000000000
2003-01-01	97.27450000000000
2004-01-01	97.13280000000000
2005-01-01	97.06570000000000
2006-01-01	97.25910000000000
2007-01-01	97.63660000000000
2008-01-01	97.91280000000000
2009-01-01	97.97660000000000
2010-01-01	98.05450000000000
2011-01-01	98.34899999999999
2012-01-01	98.60020000000000
2013-01-01	98.73180000000000
2014-01-01	98.84190000000000
2015-01-01	98.82070000000000
2016-01-01	98.71550000000000