Year	Percent
1960	-3.53938
1961	-2.13095
1962	0.81871
1963	2.8711
1964	0.06792
1965	-0.32549
1966	-1.31819
1967	-2.36236
1968	-3.03357
1969	-3.02197
1970	-2.73592
1971	1.78242
1972	1.44147
1973	12.78227
1974	23.33717
1975	5.35585
1976	8.97493
1977	1.70253
1978	1.25451
1979	10.68685
1980	-15.01062
1981	-15.57366
1982	-3.88298
1983	-9.66247
1984	-5.30726
1985	-5.4052
1986	-6.68162
1987	0.42995
1988	-7.01366
1989	-8.28049
1990	-10.52308
1991	-16.54553
1992	-14.06875
1993	4.77936
1994	14.96325
1995	8.20824
1996	5.16896
1997	1.9063
1998	-3.86146
1999	3.69863
2000	1.67687
2001	-1.92893
2002	0.65512
2003	-1.42416
2004	-0.78
2005	6.22114
2006	6.57071
2007	7.79992
2008	4.92485
2009	1.7234
2010	5.02866
2011	8.07461
2012	0.88467
2013	3.43232
2014	1.6773
2015	0.46947
2016	1.5936
2017	1.50138