Year	Percent
1962-01-01	99.0596
1963-01-01	99.1266
1964-01-01	98.8228
1965-01-01	99.1062
1966-01-01	99.1062
1967-01-01	97.9783
1968-01-01	99.8223
1969-01-01	99.8223
1970-01-01	99.8223
1971-01-01	99.8223
1972-01-01	99.9839
1973-01-01	99.9822
1974-01-01	99.9651
1975-01-01	94.6088
1976-01-01	91.9899
1977-01-01	89.8872
1978-01-01	85.0073
1979-01-01	82.5406
1980-01-01	83.1939
1981-01-01	79.7456
1982-01-01	75.6136
1983-01-01	72.3540
1984-01-01	68.5991
1985-01-01	65.9206
1986-01-01	65.7765
1987-01-01	68.6679
1988-01-01	69.9262
1989-01-01	70.6739
1990-01-01	70.7945
1991-01-01	72.4018
1992-01-01	73.9827
1993-01-01	72.9142
1994-01-01	71.0018
1995-01-01	68.0264
1996-01-01	67.9145
1997-01-01	70.6664
1998-01-01	71.0444
1999-01-01	70.1412
2000-01-01	70.3071
2001-01-01	71.1250
2002-01-01	73.4114
2003-01-01	78.3407
2004-01-01	83.9251
2005-01-01	88.5166
2006-01-01	91.1950
2007-01-01	93.2403
2008-01-01	93.5718
2009-01-01	88.6828
2010-01-01	84.5269
2011-01-01	84.3203
2012-01-01	86.2281
2013-01-01	88.4585
2014-01-01	90.5733
2015-01-01	92.6197
2016-01-01	94.5827