Year	Percent
1979-01-01	8.15167
1980-01-01	18.81660
1981-01-01	21.32540
1982-01-01	10.31490
1983-01-01	41.44680
1984-01-01	27.21200
1985-01-01	12.38840
1986-01-01	19.67140
1987-01-01	41.67520
1988-01-01	21.77120
1989-01-01	46.37530
1990-01-01	59.05630
1991-01-01	41.96840
1992-01-01	38.05610
1993-01-01	92.22320
1994-01-01	64.49040
1995-01-01	43.61210
1996-01-01	40.23450
1997-01-01	59.82120
1998-01-01	62.54740
1999-01-01	74.91640
2000-01-01	55.44890
2001-01-01	53.96330
2002-01-01	58.02100
2003-01-01	74.72360
2004-01-01	59.51830
2005-01-01	48.90900
2006-01-01	57.06620
2007-01-01	81.35260
2008-01-01	58.84710
2009-01-01	68.85610
2010-01-01	52.56150
2011-01-01	41.87650
2012-01-01	38.10330
2013-01-01	37.02300
2014-01-01	26.93210
2015-01-01	29.71170
2016-01-01	29.54660
2017-01-01	30.77570