Year	Percent
1980-01-01	4.2734500000000000
1981-01-01	5.2572300000000000
1982-01-01	6.7880400000000000
1983-01-01	9.2974700000000000
1984-01-01	12.8076000000000000
1985-01-01	13.5098000000000000
1986-01-01	10.9729999999999990
1987-01-01	9.7290200000000000
1988-01-01	7.5528300000000000
1989-01-01	6.4919400000000005
1990-01-01	5.0201900000000000
1991-01-01	4.2651699999999995
1992-01-01	4.2029500000000000
1993-01-01	15.6876000000000000
1994-01-01	22.1192000000000000
1995-01-01	20.9508000000000000
1996-01-01	19.5339000000000000
1997-01-01	17.8581000000000000
1998-01-01	16.0701000000000000
1999-01-01	10.8646000000000000
2000-01-01	8.1992300000000000
2001-01-01	7.0795500000000000
2002-01-01	7.0969500000000000
2003-01-01	5.2478099999999990
2004-01-01	4.4637600000000000
2005-01-01	4.1979500000000000
2006-01-01	4.4274600000000000
2007-01-01	4.1720500000000000
2008-01-01	2.8373600000000000
2009-01-01	7.8303899999999995
2010-01-01	7.7316000000000000
2011-01-01	6.1549400000000000
2012-01-01	8.3946399999999990
2013-01-01	10.2990000000000010
2014-01-01	12.9149000000000000
2015-01-01	13.3409000000000000
2016-01-01	11.1392000000000000