Year	Percent
1961-01-01	80.6713
1962-01-01	80.5989
1963-01-01	87.1391
1964-01-01	97.7710
1965-01-01	90.5716
1966-01-01	75.2223
1967-01-01	74.9577
1968-01-01	73.4067
1969-01-01	66.4011
1970-01-01	66.4373
1971-01-01	73.7031
1972-01-01	78.7407
1973-01-01	77.9847
1974-01-01	82.8891
1975-01-01	83.5086
1976-01-01	76.2877
1977-01-01	69.2802
1978-01-01	70.7519
1979-01-01	75.0922
1980-01-01	80.3275
1981-01-01	86.2486
1982-01-01	83.6608
1983-01-01	82.2934
1984-01-01	81.4971
1985-01-01	82.1670
1986-01-01	80.1310
1987-01-01	76.1733
1988-01-01	77.4825
1989-01-01	79.1018
1990-01-01	78.0288
1991-01-01	78.0027
1992-01-01	77.5113
1993-01-01	70.3541
1994-01-01	63.3483
1995-01-01	68.1671
1996-01-01	71.0274
1997-01-01	72.3856
1998-01-01	76.4425
1999-01-01	83.2567
2000-01-01	87.3591
2001-01-01	83.8752
2002-01-01	79.6969
2003-01-01	75.6121
2004-01-01	76.0559
2005-01-01	77.6284
2006-01-01	75.5415
2007-01-01	73.6062
2008-01-01	75.3019
2009-01-01	76.9338
2010-01-01	75.5096
2011-01-01	78.9618
2012-01-01	81.0116
2013-01-01	82.1393
2014-01-01	86.0325
2015-01-01	88.1669
2016-01-01	91.4205