Year	Percent
1960	-1.61527
1961	-1.66205
1962	-2.36613
1963	-2.7897
1964	-0.99404
1965	-0.83721
1966	-1.57356
1967	-0.85106
1968	-1.39683
1969	-1.14155
1970	-1.93384
1971	-2.92784
1972	-2.52508
1973	-2.06044
1974	-5.54659
1975	-6.81043
1976	-5.80661
1977	-6.89198
1978	-3.14179
1979	-2.66369
1980	-6.76595
1981	-4.66776
1982	-3.15282
1983	-4.08463
1984	-4.0669
1985	-3.10553
1986	-2.78958
1987	-2.1766
1988	1.10111
1989	-1.57784
1990	-4.21279
1991	-2.79375
1992	-2.95289
1993	-5.66948
1994	0.97841
1995	-4.45942
1996	-6.284
1997	-5.80689
1998	0.86233
1999	-0.2459
2000	-3.10305
2001	3.75701
2002	1.46085
2003	-1.11521
2004	-2.61872
2005	-3.40158
2006	-4.85027
2007	-4.84914
2008	-4.25381
2009	-0.78513
2010	-5.0016
2011	-8.13813
2012	-4.91058
2013	-5.80581
2014	-3.88543
2015	-2.60801
2016	-2.88548
2017	-4.49336