Year	Percent
1963-01-01	97.8561
1964-01-01	94.2447
1965-01-01	91.0923
1966-01-01	90.6585
1967-01-01	90.7563
1968-01-01	88.7231
1969-01-01	89.1320
1970-01-01	91.1058
1971-01-01	95.8863
1972-01-01	95.8863
1973-01-01	95.8863
1974-01-01	99.0700
1975-01-01	96.7532
1976-01-01	94.1268
1977-01-01	89.4198
1978-01-01	85.2929
1979-01-01	83.1837
1980-01-01	84.6850
1981-01-01	92.7382
1982-01-01	97.9953
1983-01-01	98.8206
1984-01-01	99.8673
1985-01-01	99.8673
1986-01-01	96.7612
1987-01-01	87.8015
1988-01-01	80.1535
1989-01-01	77.2392
1990-01-01	82.4875
1991-01-01	88.9638
1992-01-01	85.8642
1993-01-01	81.8521
1994-01-01	79.6136
1995-01-01	78.1421
1996-01-01	76.2729
1997-01-01	79.0375
1998-01-01	74.7778
1999-01-01	68.3749
2000-01-01	70.8272
2001-01-01	69.1637
2002-01-01	67.9975
2003-01-01	70.5897
2004-01-01	70.3227
2005-01-01	71.1666
2006-01-01	79.8236
2007-01-01	87.6682
2008-01-01	93.0185
2009-01-01	93.3232
2010-01-01	80.3696
2011-01-01	78.4923
2012-01-01	82.8841
2013-01-01	85.6731
2014-01-01	87.0179
2015-01-01	83.0194
2016-01-01	79.7376