Year	Percent
1960	0.93487
1961	-0.83615
1962	-0.0038
1963	-0.36734
1964	-0.69195
1965	1.01813
1966	-2.96296
1967	0.51623
1968	-1.30666
1969	-1.14652
1970	-1.50639
1971	-3.84897
1972	-0.52739
1973	0.8225
1974	-0.93057
1975	1.72793
1976	3.19387
1977	3.63114
1978	2.85876
1979	1.76646
1980	0.63326
1981	-3.58084
1982	-4.24459
1983	-2.78311
1984	-0.59638
1985	1.28879
1986	6.84386
1987	4.03426
1988	2.42939
1989	4.18465
1990	5.74448
1991	7.43487
1992	1.95136
1993	-2.33039
1994	-5.92081
1995	-6.42974
1996	-5.64518
1997	-5.91398
1998	-5.89422
1999	0.54388
2000	-0.83681
2001	-3.12684
2002	-3.3515
2003	-3.36558
2004	-2.32192
2005	-1.93441
2006	-2.89895
2007	-3.25143
2008	-2.47309
2009	-2.21838
2010	-1.82888
2011	-1.19666
2012	-1.77857
2013	-2.55413
2014	-5.44669
2015	-8.12424
2016	-6.95029
2017	-5.31558