Year	Percent
1979-12-31	-0.44
1980-12-31	0.9
1981-12-31	-0.29
1982-12-31	-0.14
1983-12-31	0.08
1984-12-31	-0.12
1985-12-31	-0.42
1986-12-31	-0.54
1987-12-31	-0.22
1988-12-31	-0.59
1989-12-31	-0.95
1990-12-31	-1.1
1991-12-31	-1.07
1992-12-31	-0.45
1993-12-31	-0.285
1994-12-31	-0.025
1995-12-31	-0.115
1996-12-31	-0.105
1997-12-31	-0.25
1998-12-31	-0.17
1999-12-31	0.025
2000-12-31	0.095
2001-12-31	-0.275
2002-12-31	-0.355
2003-12-31	-0.42
2004-12-31	-0.415
2005-12-31	-0.025
2006-12-31	0.04
2007-12-31	-0.175
2008-12-31	-0.125
2009-12-31	-0.025
2010-12-31	-0.035
2011-12-31	-0.045
2012-12-31	-0.015
2013-12-31	-0.035
2014-12-31	-0.035
2015-12-31	0.015
2016-12-31	0.115
2017-12-31	0.14
2018-12-31	0.205
2019-12-31	0.115