Year	Percent
1960	-1.09158
1961	-2.18136
1962	-1.73984
1963	-1.4443
1964	0.35361
1965	-0.29991
1966	-0.83857
1967	-1.11378
1968	2.24583
1969	2.37843
1970	-0.62275
1971	-2.5404
1972	0.75637
1973	-0.38406
1974	-2.68189
1975	-5.78298
1976	-8.35768
1977	-9.10087
1978	0.36164
1979	2.32953
1980	6.02459
1981	7.20331
1982	5.05732
1983	7.78549
1984	8.74417
1985	7.21975
1986	-3.3847
1987	-2.20925
1988	-0.58396
1989	3.4781
1990	6.24943
1991	7.73003
1992	6.60552
1993	6.26736
1994	5.9461
1995	6.03982
1996	8.76437
1997	8.05205
1998	1.79343
1999	7.20067
2000	16.80638
2001	16.64218
2002	13.14296
2003	12.71341
2004	13.18072
2005	15.99991
2006	16.94095
2007	13.40785
2008	16.93291
2009	11.4038
2010	11.26031
2011	12.86039
2012	13.03256
2013	10.78432
2014	8.99959
2015	5.62551
2016	0.86345
2017	2.42052