Year	Percent
1961	-6.29929
1962	9.34449
1963	-11.34238
1964	-14.09159
1965	4.65249
1966	4.23145
1967	3.81221
1968	3.70846
1969	7.55182
1970	2.78429
1971	-1.77058
1972	-2.64043
1973	0.44712
1974	-1.57667
1975	-5.08455
1976	15.77518
1977	-1.25615
1978	5.60369
1979	8.16914
1980	5.29266
1981	1.97823
1982	-1.42172
1983	2.53787
1984	-7.63183
1985	0.33928
1986	0.73873
1987	-4.84244
1988	0.06854
1989	-2.6111
1990	-2.66596
1991	0.02983
1992	11.40041
1993	-2.24591
1994	-47.80555
1995	36.9809
1996	9.29631
1997	6.74173
1998	0.57176
1999	-3.00628
2000	2.53136
2001	4.52907
2002	10.44986
2003	0.50526
2004	5.7651
2005	7.26988
2006	6.67815
2007	4.88963
2008	8.17539
2009	3.38077
2010	4.51274
2011	5.25169
2012	5.89876
2013	2.04553
2014	4.96648
2015	6.20753
2016	3.42056
2017	3.57245