Year	Percent
1980-01-01	4.9972199999999996
1981-01-01	4.7617800000000000
1982-01-01	5.3908000000000000
1983-01-01	7.3937399999999990
1984-01-01	6.5856800000000000
1985-01-01	7.2312000000000000
1986-01-01	6.5717500000000000
1987-01-01	7.6468700000000000
1988-01-01	7.4634000000000000
1989-01-01	6.3741100000000000
1990-01-01	6.1886000000000000
1991-01-01	7.9322300000000010
1992-01-01	7.2390500000000000
1993-01-01	7.4028199999999990
1994-01-01	5.2187600000000000
1995-01-01	3.7498800000000000
1996-01-01	3.7454500000000000
1997-01-01	3.5932699999999995
1998-01-01	3.3071500000000000
1999-01-01	4.3175900000000000
2000-01-01	4.5800400000000000
2001-01-01	6.8464199999999990
2002-01-01	9.8517700000000000
2003-01-01	11.2578000000000000
2004-01-01	10.6428000000000000
2005-01-01	9.7992200000000000
2006-01-01	10.7019000000000000
2007-01-01	9.1741400000000000
2008-01-01	11.0201000000000000
2009-01-01	8.4043600000000000
2010-01-01	9.4058700000000000
2011-01-01	10.4130000000000000
2012-01-01	11.0064000000000000
2013-01-01	11.3025000000000000
2014-01-01	9.7078400000000000
2015-01-01	10.9886000000000000
2016-01-01	10.2468000000000000