Year	Percent
1960	-3.15816
1961	-2.20277
1962	-1.53963
1963	-1.63344
1964	-2.22036
1965	-1.88842
1966	-1.54283
1967	-2.14172
1968	-2.31572
1969	-1.72451
1970	-1.90306
1971	-1.07888
1972	-0.76973
1973	-1.05279
1974	-2.16378
1975	-2.72564
1976	-1.37741
1977	0.0969
1978	-0.5688
1979	-1.26179
1980	-2.26872
1981	-2.527
1982	5.01546
1983	9.58135
1984	7.82851
1985	5.08106
1986	3.90647
1987	6.1123
1988	1.39004
1989	-0.06479
1990	-1.1046
1991	-2.90758
1992	-5.03375
1993	-3.26532
1994	-3.94426
1995	1.97737
1996	1.59083
1997	-0.1115
1998	-1.80726
1999	-1.35267
2000	-1.61925
2001	-1.83263
2002	-1.59293
2003	-1.48481
2004	-1.59555
2005	-1.60354
2006	-1.4424
2007	-1.74081
2008	-2.37404
2009	-1.65777
2010	-1.36499
2011	-1.39626
2012	-1.23611
2013	-1.15357
2014	-1.17879
2015	-2.04135
2016	-1.9784
2017	-1.80537