Year	Percent
1960-01-01	89.4408
1961-01-01	89.2578
1962-01-01	89.9215
1963-01-01	90.8638
1964-01-01	91.2362
1965-01-01	92.3361
1966-01-01	92.5553
1967-01-01	92.4738
1968-01-01	93.6055
1969-01-01	94.1902
1970-01-01	95.1743
1971-01-01	96.2829
1972-01-01	96.7336
1973-01-01	97.3389
1974-01-01	97.8268
1975-01-01	97.3692
1976-01-01	97.0804
1977-01-01	97.7004
1978-01-01	98.4666
1979-01-01	98.7770
1980-01-01	98.9012
1981-01-01	99.2496
1982-01-01	99.3533
1983-01-01	99.0252
1984-01-01	98.6082
1985-01-01	98.4881
1986-01-01	98.6643
1987-01-01	98.7305
1988-01-01	98.8196
1989-01-01	98.9762
1990-01-01	98.9398
1991-01-01	98.8833
1992-01-01	98.8299
1993-01-01	98.8328
1994-01-01	98.9879
1995-01-01	99.1118
1996-01-01	99.1421
1997-01-01	99.1254
1998-01-01	99.1254
1999-01-01	99.6907
2000-01-01	99.7059
2001-01-01	99.7233
2002-01-01	99.7396
2003-01-01	99.7046
2004-01-01	99.6419
2005-01-01	99.6100
2006-01-01	99.5868
2007-01-01	99.5565
2008-01-01	99.4212
2009-01-01	99.2687
2010-01-01	99.1102
2011-01-01	98.5852
2012-01-01	97.8626
2013-01-01	97.8151
2014-01-01	98.1774
2015-01-01	96.6007
2016-01-01	92.4909