Year	Percent
1983-01-01	8.0592300000000000
1984-01-01	8.7091700000000000
1985-01-01	8.8531000000000000
1986-01-01	6.9052000000000000
1987-01-01	7.8343500000000000
1988-01-01	7.1239700000000000
1989-01-01	5.8448000000000000
1990-01-01	5.2899900000000000
1991-01-01	4.2208500000000000
1992-01-01	3.1993099999999997
1993-01-01	2.5513500000000000
1994-01-01	2.6537500000000000
1995-01-01	2.2786000000000000
1996-01-01	0.8761080000000000
1997-01-01	4.7100900000000000
1998-01-01	8.8274700000000000
1999-01-01	11.0713000000000000
2000-01-01	13.1522000000000000
2001-01-01	12.2970000000000000
2002-01-01	16.2147000000000000
2003-01-01	11.7099000000000000
2004-01-01	11.1367000000000000
2005-01-01	10.2197000000000000
2006-01-01	11.6754000000000000
2007-01-01	11.4124000000000000
2008-01-01	11.3459999999999980
2009-01-01	13.8825000000000000
2010-01-01	13.1960000000000000
2011-01-01	19.0544000000000000
2012-01-01	17.7625000000000000
2013-01-01	17.5333000000000000
2014-01-01	13.7716000000000000
2015-01-01	14.9993000000000000
2016-01-01	15.0612000000000000