Year	Percent
1961	3.18841
1962	-5.41071
1963	-2.52924
1964	0.13832
1965	-1.03099
1966	-1.39169
1967	2.5011
1968	-0.71837
1969	4.88807
1970	0.29099
1971	-0.81631
1972	-1.88048
1973	-0.03243
1974	4.25695
1975	-1.67795
1976	3.13038
1977	1.44272
1978	-1.21501
1979	-4.94139
1980	-7.04476
1981	-4.35432
1982	4.50739
1983	-10.86418
1984	6.38101
1985	1.22752
1986	1.16806
1987	-6.94913
1988	-0.35135
1989	-0.16773
1990	-4.38139
1991	-3.02152
1992	-8.87797
1993	-2.3587
1994	2.12476
1995	4.47919
1996	-6.3207
1997	2.86038
1998	2.36957
1999	1.37038
2000	-4.52737
2001	2.35983
2002	1.61695
2003	-7.15695
2004	4.07703
2005	-0.87322
2006	2.92968
2007	2.7961
2008	0.41986
2009	0.35032
2010	2.02058
2011	2.66312
2012	3.7821
2013	-36.8299
2014	0.68783
2015	4.09198
2016	3.42739
2017	2.85693