Year	Percent
1980-01-01	4.6575000000000000
1981-01-01	4.5775900000000000
1982-01-01	10.0515000000000000
1983-01-01	11.6166000000000000
1984-01-01	9.1421100000000000
1985-01-01	8.7166900000000000
1986-01-01	7.8488899999999990
1987-01-01	7.1485199999999995
1988-01-01	7.6806100000000010
1989-01-01	6.9426500000000000
1990-01-01	7.0517199999999995
1991-01-01	6.7570000000000010
1992-01-01	5.2537900000000000
1993-01-01	5.7536600000000000
1994-01-01	5.6671100000000000
1995-01-01	5.6892500000000000
1996-01-01	7.2682800000000000
1997-01-01	8.9939300000000000
1998-01-01	8.8346600000000010
1999-01-01	6.9959399999999990
2000-01-01	9.3714900000000000
2001-01-01	12.1828000000000000
2002-01-01	13.1215000000000000
2003-01-01	10.9886000000000000
2004-01-01	9.0790200000000000
2005-01-01	7.1453000000000000
2006-01-01	8.3766100000000010
2007-01-01	8.3568199999999990
2008-01-01	9.8091600000000000
2009-01-01	11.0678000000000000
2010-01-01	10.2992000000000000
2011-01-01	10.3009000000000000
2012-01-01	8.2322800000000010
2013-01-01	6.8034700000000000
2014-01-01	5.6442700000000000
2015-01-01	4.2116800000000000
2016-01-01	3.9228400000000003