Year	Percent
1979-12-31	-1.21
1980-12-31	2
1981-12-31	-0.72
1982-12-31	-0.4
1983-12-31	0.26
1984-12-31	-0.35
1985-12-31	-1.29
1986-12-31	-1.69
1987-12-31	-0.64
1988-12-31	-1.61
1989-12-31	-2.54
1990-12-31	-2.89
1991-12-31	-3.11
1992-12-31	-1.335
1993-12-31	-0.705
1994-12-31	-0.045
1995-12-31	-0.335
1996-12-31	-0.38
1997-12-31	-0.73
1998-12-31	-0.425
1999-12-31	0.01
2000-12-31	0.21
2001-12-31	-0.755
2002-12-31	-1.01
2003-12-31	-1.265
2004-12-31	-1.05
2005-12-31	0
2006-12-31	0.055
2007-12-31	-0.49
2008-12-31	-0.235
2009-12-31	-0.09
2010-12-31	-0.115
2011-12-31	-0.135
2012-12-31	-0.045
2013-12-31	-0.105
2014-12-31	-0.115
2015-12-31	0.02
2016-12-31	0.285
2017-12-31	0.41
2018-12-31	0.57
2019-12-31	0.33