Year	Percent
1978-01-01	0.799243000000000
1979-01-01	0.721784000000000
1980-01-01	0.699504000000000
1981-01-01	0.727336000000000
1982-01-01	0.735470000000000
1983-01-01	0.735470000000000
1984-01-01	0.735470000000000
1985-01-01	0.735470000000000
1986-01-01	0.735470000000000
1987-01-01	0.735470000000000
1988-01-01	0.735470000000000
1989-01-01	0.735470000000000
1990-01-01	0.735470000000000
1991-01-01	0.735470000000000
1992-01-01	0.735470000000000
1993-01-01	0.735470000000000
1994-01-01	0.735470000000000
1995-01-01	7.431189999999999
1996-01-01	8.249720000000000
1997-01-01	0.134714000000000
1998-01-01	10.317800000000000
1999-01-01	1.203400000000000
2000-01-01	1.522750000000000
2001-01-01	4.010800000000000
2002-01-01	13.595000000000000
2003-01-01	15.245900000000000
2004-01-01	16.963900000000000
2005-01-01	17.872000000000000
2006-01-01	19.702800000000000
2007-01-01	17.930999999999997
2008-01-01	16.821500000000000
2009-01-01	20.957300000000000
2010-01-01	19.562700000000000
2011-01-01	17.459700000000000
2012-01-01	20.324500000000000
2013-01-01	19.875999999999998
2014-01-01	22.511200000000000
2015-01-01	22.800300000000000
2016-01-01	22.166300000000000