Year	Percent
1978-01-01	0.20088800000000000
1979-01-01	0.23778000000000002
1980-01-01	0.16215400000000000
1981-01-01	0.13227400000000000
1982-01-01	0.08693000000000000
1983-01-01	0.32848299999999997
1984-01-01	0.32848299999999997
1985-01-01	0.32848299999999997
1986-01-01	0.32848299999999997
1987-01-01	0.32848299999999997
1988-01-01	0.32848299999999997
1989-01-01	0.32848299999999997
1990-01-01	0.32848299999999997
1991-01-01	0.32848299999999997
1992-01-01	0.32848299999999997
1993-01-01	0.32848299999999997
1994-01-01	0.32848299999999997
1995-01-01	0.32848299999999997
1996-01-01	0.32848299999999997
1997-01-01	0.32848299999999997
1998-01-01	0.32848299999999997
1999-01-01	0.32848299999999997
2000-01-01	0.32848299999999997
2001-01-01	0.32848299999999997
2002-01-01	0.32848299999999997
2003-01-01	11.10180000000000000
2004-01-01	10.49590000000000000
2005-01-01	9.50122000000000000
2006-01-01	9.73537000000000000
2007-01-01	6.96751999999999950
2008-01-01	6.71078999999999900
2009-01-01	8.86050000000000000
2010-01-01	12.15570000000000000
2011-01-01	10.17030000000000000
2012-01-01	11.68640000000000000
2013-01-01	12.21750000000000000
2014-01-01	16.53420000000000000
2015-01-01	14.97970000000000000
2016-01-01	21.53820000000000000
2017-01-01	21.25440000000000000