Year	Percent
1962-01-01	6.7232000000000000
1963-01-01	7.2589200000000000
1964-01-01	7.2028700000000000
1965-01-01	7.6382600000000010
1966-01-01	7.9197899999999990
1967-01-01	8.8910700000000000
1968-01-01	9.5553700000000000
1969-01-01	10.2951000000000000
1970-01-01	7.6269100000000005
1971-01-01	8.0245500000000000
1972-01-01	8.7216300000000010
1973-01-01	8.9342500000000000
1974-01-01	8.6469200000000000
1975-01-01	8.3984100000000000
1976-01-01	9.3330800000000000
1977-01-01	10.6246000000000000
1978-01-01	11.9885000000000000
1979-01-01	11.3095000000000000
1980-01-01	10.7812000000000000
1981-01-01	11.7492000000000000
1982-01-01	11.2241000000000000
1983-01-01	9.0737300000000000
1984-01-01	8.6298000000000000
1985-01-01	9.2705399999999990
1986-01-01	10.1800000000000000
1987-01-01	9.6888399999999990
1988-01-01	9.6267400000000000
1989-01-01	10.4409999999999990
1990-01-01	11.1392000000000000
1991-01-01	12.1671000000000000
1992-01-01	13.8068000000000000
1993-01-01	14.8956000000000000
1994-01-01	15.1438000000000000
1995-01-01	13.4047000000000000
1996-01-01	12.6428000000000000
1997-01-01	13.3316000000000000
1998-01-01	13.1890000000000000
1999-01-01	12.5822000000000000
2000-01-01	13.0267000000000000
2001-01-01	13.8052000000000000
2002-01-01	16.9388000000000000
2003-01-01	15.0351000000000000
2004-01-01	15.0132000000000000
2005-01-01	13.9389000000000000
2006-01-01	13.7061000000000000
2007-01-01	14.8579000000000000
2008-01-01	14.9548000000000000
2009-01-01	16.2562000000000000
2010-01-01	16.4116000000000000
2011-01-01	16.6419000000000000
2012-01-01	16.9074000000000000
2013-01-01	16.6820000000000020
2014-01-01	16.2237000000000000
2015-01-01	16.6146000000000000
2016-01-01	17.3678000000000000