Year	Percent
1986-01-01	39.09
1987-01-01	42.36
1988-01-01	46.77
1989-01-01	26.87
1990-01-01	62.72
1991-01-01	59.87
1992-01-01	67.77
1993-01-01	69.63
1994-01-01	92.04
1995-01-01	106.31
1996-01-01	73.99
1997-01-01	78.04
1998-01-01	78.97
1999-01-01	69.97
2000-01-01	183.20
2001-01-01	59.00
2002-01-01	44.00
2003-01-01	26.00
2004-01-01	18.69
2005-01-01	13.57
2006-01-01	17.50
2007-01-01	15.96
2008-01-01	15.63
2009-01-01	6.50
2010-01-01	1.63
2011-01-01	5.00
2012-01-01	5.00
2013-01-01	3.50
2014-01-01	7.50
2015-01-01	7.25
2016-01-01	7.25
2017-01-01	7.25