Year	Percent
1980-01-01	2.3000
1981-01-01	0.0500
1982-01-01	0.5000
1983-01-01	1.1800
1984-01-01	0.4700
1985-01-01	1.7500
1986-01-01	2.0200
1987-01-01	2.1400
1988-01-01	0.8700
1989-01-01	1.2100
1990-01-01	1.2100
1991-01-01	1.2100
1992-01-01	0.3700
1993-01-01	1.5600
1994-01-01	1.5800
1995-01-01	2.1400
1996-01-01	2.8800
1997-01-01	2.7100
1998-01-01	2.5600
1999-01-01	2.7000
2000-01-01	3.1900
2001-01-01	3.1448
2002-01-01	3.1581
2003-01-01	2.7377
2004-01-01	3.4573
2005-01-01	4.0816
2006-01-01	3.2925
2007-01-01	2.9549
2008-01-01	2.5698
2009-01-01	3.3851
2010-01-01	2.9720
2011-01-01	3.0494
2012-01-01	2.6880
2013-01-01	2.4299
2014-01-01	2.2534
2015-01-01	2.9154
2016-01-01	2.8971