Year	Percent
1960-01-01	97.64270000000000
1961-01-01	97.64430000000000
1962-01-01	97.63570000000000
1963-01-01	97.83070000000000
1964-01-01	98.07450000000000
1965-01-01	98.21230000000000
1966-01-01	98.34000000000000
1967-01-01	98.41490000000000
1968-01-01	98.51480000000000
1969-01-01	98.56040000000000
1970-01-01	98.60060000000000
1971-01-01	98.65540000000000
1972-01-01	98.71400000000000
1973-01-01	98.83870000000000
1974-01-01	98.94270000000000
1975-01-01	99.05170000000000
1976-01-01	99.13840000000000
1977-01-01	99.17680000000000
1978-01-01	99.21740000000000
1979-01-01	99.19890000000000
1980-01-01	99.18460000000000
1981-01-01	99.14070000000000
1982-01-01	99.02799999999999
1983-01-01	98.99610000000000
1984-01-01	98.89820000000000
1985-01-01	98.90100000000001
1986-01-01	98.91210000000000
1987-01-01	98.84370000000000
1988-01-01	98.86860000000000
1989-01-01	98.68040000000000
1990-01-01	98.54930000000000
1991-01-01	98.57590000000000
1992-01-01	98.67280000000000
1993-01-01	99.03430000000000
1994-01-01	99.31270000000000
1995-01-01	99.38170000000000
1996-01-01	99.42130000000000
1997-01-01	99.45270000000000
1998-01-01	99.45270000000000
1999-01-01	99.66380000000000
2000-01-01	99.73940000000000
2001-01-01	99.67720000000000
2002-01-01	99.77900000000000
2003-01-01	99.90710000000000
2004-01-01	99.90260000000000
2005-01-01	99.90470000000000
2006-01-01	99.93150000000000
2007-01-01	99.89410000000000
2008-01-01	99.83130000000000
2009-01-01	99.83250000000000
2010-01-01	99.85770000000000
2011-01-01	99.81690000000000
2012-01-01	99.82710000000000
2013-01-01	99.86180000000000
2014-01-01	99.73820000000000
2015-01-01	98.40390000000000
2016-01-01	95.45320000000000