Year	Percent
1960-01-01	12.7250000000000000
1961-01-01	12.4792000000000000
1962-01-01	12.6819000000000000
1963-01-01	11.9566000000000000
1964-01-01	11.3159999999999990
1965-01-01	11.4591000000000000
1966-01-01	11.2886000000000000
1967-01-01	10.5759000000000000
1968-01-01	10.4186000000000000
1969-01-01	9.8112700000000000
1970-01-01	8.7558700000000000
1971-01-01	9.0604200000000000
1972-01-01	9.4343700000000000
1973-01-01	8.8278400000000000
1974-01-01	8.4095500000000000
1975-01-01	8.0700800000000000
1976-01-01	7.9023300000000000
1977-01-01	7.5905300000000000
1978-01-01	7.3270100000000005
1979-01-01	7.6074500000000000
1980-01-01	8.1687300000000000
1981-01-01	9.5306100000000010
1982-01-01	10.7018000000000000
1983-01-01	11.2417000000000000
1984-01-01	11.8082000000000000
1985-01-01	12.6781000000000000
1986-01-01	13.7098000000000000
1987-01-01	13.9952000000000000
1988-01-01	13.7577000000000000
1989-01-01	13.8047000000000000
1990-01-01	14.0437000000000000
1991-01-01	14.4743000000000000
1992-01-01	13.6109999999999990
1993-01-01	12.1333000000000000
1994-01-01	10.5770000000000000
1995-01-01	8.9142100000000000
1996-01-01	8.7567700000000000
1997-01-01	8.6234200000000000
1998-01-01	8.2613500000000000
1999-01-01	7.8035900000000000
2000-01-01	7.3253200000000000
2001-01-01	6.5609600000000010
2002-01-01	5.4299500000000000
2003-01-01	3.1261200000000002
2004-01-01	2.1977599999999997
2005-01-01	2.1978800000000000
2006-01-01	2.0531599999999997
2007-01-01	2.0168100000000000
2008-01-01	1.7876400000000001
2009-01-01	1.9921700000000000
2010-01-01	3.3483300000000003
2011-01-01	4.7032900000000000
2012-01-01	5.4542600000000000
2013-01-01	5.8846400000000000
2014-01-01	4.9165100000000000
2015-01-01	4.0064800000000010
2016-01-01	4.5105200000000000