Year	Percent
1960-01-01	95.8457
1961-01-01	96.4344
1962-01-01	97.4393
1963-01-01	98.0076
1964-01-01	98.1629
1965-01-01	97.9808
1966-01-01	96.5833
1967-01-01	94.4973
1968-01-01	94.4125
1969-01-01	96.0957
1970-01-01	97.3814
1971-01-01	97.9545
1972-01-01	98.0187
1973-01-01	98.0605
1974-01-01	97.7264
1975-01-01	97.1414
1976-01-01	96.6012
1977-01-01	96.5528
1978-01-01	96.8959
1979-01-01	96.8531
1980-01-01	96.4461
1981-01-01	95.9635
1982-01-01	95.8228
1983-01-01	95.6992
1984-01-01	95.8495
1985-01-01	96.6322
1986-01-01	97.1975
1987-01-01	97.5648
1988-01-01	98.0457
1989-01-01	98.4235
1990-01-01	98.7372
1991-01-01	98.9756
1992-01-01	98.9431
1993-01-01	98.6666
1994-01-01	98.5027
1995-01-01	98.5872
1996-01-01	98.7678
1997-01-01	98.9152
1998-01-01	99.0403
1999-01-01	99.6795
2000-01-01	99.7808
2001-01-01	99.8767
2002-01-01	99.9202
2003-01-01	99.9782
2004-01-01	99.9932
2005-01-01	99.9939
2006-01-01	99.8735
2007-01-01	99.7380
2008-01-01	99.7333
2009-01-01	99.6809
2010-01-01	99.6601
2011-01-01	99.7426
2012-01-01	99.8282
2013-01-01	99.8661
2014-01-01	99.7945
2015-01-01	98.1143
2016-01-01	94.2522