Year	Percent
1960-01-01	97.677100000000000
1961-01-01	97.123300000000000
1962-01-01	96.157900000000000
1963-01-01	95.058300000000000
1964-01-01	92.835500000000000
1965-01-01	91.452600000000000
1966-01-01	89.302800000000000
1967-01-01	85.421500000000000
1968-01-01	82.370700000000000
1969-01-01	81.982700000000000
1970-01-01	83.247300000000000
1971-01-01	85.103100000000000
1972-01-01	85.901500000000000
1973-01-01	86.728400000000000
1974-01-01	88.155100000000000
1975-01-01	87.644300000000000
1976-01-01	85.691000000000000
1977-01-01	83.241800000000000
1978-01-01	76.670300000000000
1979-01-01	72.047800000000000
1980-01-01	70.883400000000000
1981-01-01	62.838300000000000
1982-01-01	56.415800000000000
1983-01-01	56.232400000000000
1984-01-01	52.847400000000000
1985-01-01	54.457700000000000
1986-01-01	53.335700000000000
1987-01-01	53.261200000000000
1988-01-01	55.966700000000000
1989-01-01	57.964700000000000
1990-01-01	60.092400000000000
1991-01-01	60.137700000000000
1992-01-01	63.086600000000000
1993-01-01	69.406600000000000
1994-01-01	72.825400000000000
1995-01-01	70.803500000000000
1996-01-01	61.266999999999996
1997-01-01	59.728400000000000
1998-01-01	63.972900000000000
1999-01-01	71.641600000000000
2000-01-01	81.247900000000000
2001-01-01	89.707500000000000
2002-01-01	94.796600000000000
2003-01-01	95.659400000000000
2004-01-01	96.285900000000000
2005-01-01	96.719900000000000
2006-01-01	97.169100000000000
2007-01-01	97.946800000000000
2008-01-01	98.635000000000000
2009-01-01	98.975100000000000
2010-01-01	99.161100000000000
2011-01-01	99.342600000000000
2012-01-01	99.521100000000000
2013-01-01	99.677000000000000
2014-01-01	99.815600000000000
2015-01-01	99.942600000000000
2016-01-01	100.000000000000000