Year	Percent
1985-01-01	21.8395000000000000
1986-01-01	23.5357000000000000
1987-01-01	21.5340000000000020
1988-01-01	19.1134000000000000
1989-01-01	23.0069999999999980
1990-01-01	22.2523000000000000
1991-01-01	25.6781000000000000
1992-01-01	21.0206000000000000
1993-01-01	9.9272400000000000
1994-01-01	3.4260400000000000
1995-01-01	3.3610599999999997
1996-01-01	3.3958400000000000
1997-01-01	2.9866700000000000
1998-01-01	5.2153599999999996
1999-01-01	3.9093400000000003
2000-01-01	2.9679400000000000
2001-01-01	2.5953300000000000
2002-01-01	3.0716500000000000
2003-01-01	2.3827000000000000
2004-01-01	1.7814599999999998
2005-01-01	1.8009000000000000
2006-01-01	2.0887800000000000
2007-01-01	2.4099100000000000
2008-01-01	3.0779600000000000
2009-01-01	5.3747800000000000
2010-01-01	5.8750599999999995
2011-01-01	6.2172900000000000
2012-01-01	5.8000500000000000
2013-01-01	6.5653600000000010
2014-01-01	8.4657200000000000
2015-01-01	14.4434000000000000
2016-01-01	18.6649000000000000