Year	Percent
1973-01-01	5.0789100000000000
1974-01-01	3.4038300000000000
1975-01-01	3.4329600000000000
1976-01-01	3.5374100000000000
1977-01-01	3.1668800000000000
1978-01-01	2.6025800000000000
1979-01-01	2.2039700000000000
1980-01-01	2.0143100000000000
1981-01-01	2.8003200000000000
1982-01-01	2.6929900000000000
1983-01-01	1.9663300000000000
1984-01-01	1.5683000000000000
1985-01-01	1.4182100000000000
1986-01-01	1.4182100000000000
1987-01-01	1.4182100000000000
1988-01-01	1.4182100000000000
1989-01-01	1.4182100000000000
1990-01-01	1.4182100000000000
1991-01-01	1.4182100000000000
1992-01-01	1.4182100000000000
1993-01-01	0.3021410000000000
1994-01-01	0.2836790000000000
1995-01-01	0.7069270000000001
1996-01-01	1.4512300000000000
1997-01-01	1.6565800000000000
1998-01-01	1.6948000000000000
1999-01-01	2.3843900000000002
2000-01-01	2.9328200000000000
2001-01-01	3.6273699999999995
2002-01-01	3.7836000000000000
2003-01-01	2.9011500000000000
2004-01-01	2.4344200000000003
2005-01-01	3.1702400000000000
2006-01-01	4.5743599999999995
2007-01-01	4.7206700000000000
2008-01-01	4.0391699999999995
2009-01-01	3.4368100000000000
2010-01-01	2.8181800000000000
2011-01-01	3.3730000000000000
2012-01-01	3.5461199999999997
2013-01-01	2.5061000000000000
2014-01-01	1.4348800000000000
2015-01-01	0.8636389999999999
2016-01-01	0.8387200000000000