Year	Percent
1970	-2.93108
1971	0.78684
1972	2.9703
1973	0.14956
1974	-12.19249
1975	-6.85729
1976	-2.57658
1977	-1.60209
1978	0.74116
1979	-1.56235
1980	-1.08804
1981	-3.05567
1982	-2.9498
1983	-1.16769
1984	-2.54947
1985	-2.11156
1986	0.50386
1987	2.2404
1988	3.95452
1989	0.71816
1990	0.91509
1991	3.68621
1992	3.15034
1993	3.65617
1994	2.7497
1995	1.8725
1996	1.58159
1997	1.3939
1998	1.33861
1999	0.49987
2000	2.97401
2001	3.62826
2002	3.03815
2003	1.76468
2004	0.28727
2005	-1.44843
2006	-0.3858
2007	0.12096
2008	-0.25103
2009	2.32277
2010	2.2946
2011	1.54801
2012	0.69572
2013	1.57966
2014	0.72821
2015	0.75931
2016	0.3126