Year	Percent
1973-01-01	11.7500
1974-01-01	5.5690
1975-01-01	8.3280
1976-01-01	8.2820
1977-01-01	7.7780
1978-01-01	16.4920
1979-01-01	10.7540
1980-01-01	18.5980
1981-01-01	18.7310
1982-01-01	20.3050
1983-01-01	16.9870
1984-01-01	12.1810
1985-01-01	9.9400
1986-01-01	11.7570
1987-01-01	13.9990
1988-01-01	12.3990
1989-01-01	15.4870
1990-01-01	14.9130
1991-01-01	12.6430
1992-01-01	15.1040
1993-01-01	9.1370
1994-01-01	7.4730
1995-01-01	9.4130
1996-01-01	6.5500
1997-01-01	4.8900
1998-01-01	3.0000
1999-01-01	3.0418
2000-01-01	4.8268
2001-01-01	3.3389
2002-01-01	3.0945
2003-01-01	2.0567
2004-01-01	2.0535
2005-01-01	2.2757
2006-01-01	3.5011
2007-01-01	3.8791
2008-01-01	2.4864
2009-01-01	0.3546
2010-01-01	0.4981
2011-01-01	0.6270
2012-01-01	0.0734
2013-01-01	0.1686
2014-01-01	-0.0301
2015-01-01	-0.1990
2016-01-01	-0.3504
2017-01-01	-0.3423