Year	Percent
1981-01-01	1.9559600000000000
1982-01-01	1.3688300000000000
1983-01-01	1.2284100000000000
1984-01-01	0.8801740000000000
1985-01-01	2.8764300000000000
1986-01-01	1.7382200000000000
1987-01-01	0.5755550000000000
1988-01-01	0.9332990000000000
1989-01-01	0.5388760000000000
1990-01-01	1.5491900000000000
1991-01-01	2.6772000000000000
1992-01-01	3.3128300000000004
1993-01-01	3.4628200000000000
1994-01-01	3.2945900000000004
1995-01-01	3.3210000000000000
1996-01-01	3.5958200000000000
1997-01-01	3.6734800000000000
1998-01-01	3.6749400000000003
1999-01-01	3.7951500000000000
2000-01-01	4.1986000000000000
2001-01-01	4.8023200000000000
2002-01-01	4.4583300000000000
2003-01-01	4.9041700000000000
2004-01-01	5.0000000000000000
2005-01-01	5.1666700000000000
2006-01-01	5.3500000000000000
2007-01-01	3.6666700000000000
2008-01-01	4.1833300000000010
2009-01-01	2.9416700000000002
2010-01-01	3.0666700000000002
2011-01-01	3.4000000000000000
2012-01-01	3.0583299999999998
2013-01-01	2.9291700000000000
2014-01-01	3.0458300000000000
2015-01-01	3.2708300000000000
2016-01-01	3.2791699999999997