Year	Percent
1960-01-01	14.3577000000000000
1961-01-01	13.8802000000000000
1962-01-01	13.6842000000000000
1963-01-01	13.6899000000000000
1964-01-01	12.7990000000000010
1965-01-01	13.2881000000000000
1966-01-01	14.0867000000000000
1967-01-01	14.7667000000000000
1968-01-01	13.3131000000000000
1969-01-01	13.5235000000000000
1970-01-01	13.2051000000000000
1971-01-01	14.3336000000000000
1972-01-01	15.7344000000000000
1973-01-01	12.5270000000000010
1974-01-01	8.3312300000000000
1975-01-01	7.6957600000000010
1976-01-01	8.3702800000000010
1977-01-01	9.8107899999999990
1978-01-01	11.7858000000000000
1979-01-01	13.0792000000000000
1980-01-01	13.1699000000000000
1981-01-01	12.7381000000000000
1982-01-01	13.0337000000000000
1983-01-01	13.1738000000000000
1984-01-01	12.2201000000000000
1985-01-01	11.7718000000000000
1986-01-01	11.9075000000000000
1987-01-01	12.2237000000000000
1988-01-01	11.1074000000000000
1989-01-01	10.7736000000000000
1990-01-01	11.3242000000000000
1991-01-01	11.3127000000000000
1992-01-01	10.9988000000000000
1993-01-01	11.2377000000000000
1994-01-01	10.3512000000000000
1995-01-01	9.7155000000000000
1996-01-01	10.3867000000000000
1997-01-01	9.7148000000000000
1998-01-01	9.5461700000000000
1999-01-01	11.7818000000000000
2000-01-01	13.5723000000000000
2001-01-01	11.2829000000000000
2002-01-01	7.2537300000000000
2003-01-01	3.7887800000000005
2004-01-01	4.3540600000000000
2005-01-01	6.8179399999999990
2006-01-01	7.0052800000000000
2007-01-01	6.4552500000000000
2008-01-01	9.7093100000000000
2009-01-01	11.0192000000000000
2010-01-01	10.3291000000000000
2011-01-01	8.7543100000000000
2012-01-01	8.2932899999999990
2013-01-01	10.4664000000000000
2014-01-01	11.5614000000000000
2015-01-01	9.2983800000000000
2016-01-01	9.2285800000000010