Year	Percent
1965-01-01	6.2624900000000010
1966-01-01	5.8050400000000000
1967-01-01	6.4967500000000000
1968-01-01	7.7732899999999990
1969-01-01	9.0220899999999990
1970-01-01	5.3613100000000000
1971-01-01	5.4372900000000000
1972-01-01	5.9786600000000000
1973-01-01	5.4974000000000000
1974-01-01	5.2750900000000005
1975-01-01	5.4406200000000000
1976-01-01	6.3606400000000000
1977-01-01	7.4258600000000010
1978-01-01	8.5999600000000010
1979-01-01	13.0614000000000000
1980-01-01	11.2142000000000000
1981-01-01	11.0204000000000000
1982-01-01	10.6679000000000000
1983-01-01	10.4223000000000000
1984-01-01	9.4009300000000000
1985-01-01	7.6619699999999990
1986-01-01	7.1509500000000000
1987-01-01	6.3329500000000000
1988-01-01	4.8036800000000000
1989-01-01	5.1124700000000000
1990-01-01	6.3196800000000000
1991-01-01	6.0373600000000000
1992-01-01	7.4872900000000000
1993-01-01	5.6968600000000000
1994-01-01	5.5061900000000000
1995-01-01	3.8092500000000000
1996-01-01	2.5104800000000000
1997-01-01	2.2923600000000000
1998-01-01	2.8579300000000000
1999-01-01	3.7202699999999997
2000-01-01	4.2829100000000000
2001-01-01	4.5861500000000000
2002-01-01	4.1796000000000000
2003-01-01	3.9453300000000002
2004-01-01	3.9348800000000000
2005-01-01	4.9011800000000000
2006-01-01	5.7891400000000000
2007-01-01	7.1834100000000000
2008-01-01	7.9947600000000000
2009-01-01	9.2096100000000010
2010-01-01	11.3426000000000000
2011-01-01	12.6118000000000000
2012-01-01	12.8970000000000000
2013-01-01	11.5493000000000000
2014-01-01	10.6096000000000000
2015-01-01	10.4112000000000000
2016-01-01	9.9978000000000000