Year	Percent
1983-01-01	17.83780
1984-01-01	17.92850
1985-01-01	24.65440
1986-01-01	26.28180
1987-01-01	40.06220
1988-01-01	34.86080
1989-01-01	35.55200
1990-01-01	24.62710
1991-01-01	20.10920
1992-01-01	16.89240
1993-01-01	14.38220
1994-01-01	17.61180
1995-01-01	12.99070
1996-01-01	9.81265
1997-01-01	14.03250
1998-01-01	20.88220
1999-01-01	18.34610
2000-01-01	14.39790
2001-01-01	15.56130
2002-01-01	16.42070
2003-01-01	18.29990
2004-01-01	14.67200
2005-01-01	11.01610
2006-01-01	14.81180
2007-01-01	17.70240
2008-01-01	13.46350
2009-01-01	7.00283
2010-01-01	6.92965
2011-01-01	5.25665
2012-01-01	7.04253
2013-01-01	9.68667
2014-01-01	10.33480
2015-01-01	11.98670
2016-01-01	11.55710