Year	Percent
1980-01-01	13.57154051080880
1981-01-01	10.74469360839760
1982-01-01	9.90443092962609
1983-01-01	6.05263157894738
1984-01-01	6.51238546816920
1985-01-01	5.21385604530717
1986-01-01	6.28535512256450
1987-01-01	2.79166666666697
1988-01-01	4.60251046025085
1989-01-01	6.74083769633498
1990-01-01	9.99999999999999
1991-01-01	6.80877887943638
1992-01-01	3.94771176824033
1993-01-01	5.62034032088489
1994-01-01	5.84599069051722
1995-01-01	7.66624969901740
1996-01-01	4.72263116080383
1997-01-01	4.40396994729312
1998-01-01	3.67281199436184
1999-01-01	3.26397175312687
2000-01-01	4.14165764702058
2001-01-01	3.41040462427740
2002-01-01	3.30012175283749
2003-01-01	3.30255386407089
2004-01-01	3.19785359150894
2005-01-01	3.38354172930146
2006-01-01	3.70978479803868
2007-01-01	5.10383437625303
2008-01-01	9.07943964557991
2009-01-01	3.13111828379103
2010-01-01	3.16340141172307
2011-01-01	4.80093710010503
2012-01-01	4.03932356139044
2013-01-01	3.25762135179678
2014-01-01	2.12000175718139
2015-01-01	1.54869158222488
2016-01-01	1.57530222923043
2017-01-01	2.07032579116871