Year	Percent
1960	-2.57436
1961	1.58722
1962	1.91266
1963	3.07018
1964	4.17718
1965	0.70146
1966	1.53883
1967	-0.90868
1968	0.10345
1969	1.43995
1970	-0.83819
1971	-6.54975
1972	-2.13925
1973	-1.27518
1974	-7.22164
1975	-4.6879
1976	0.69483
1977	3.36577
1978	-9.7525
1979	-5.85787
1980	-6.38287
1981	-3.36042
1982	-4.90081
1983	-2.26284
1984	-5.30411
1985	-4.84757
1986	-4.04468
1987	-5.09233
1988	-5.23255
1989	-7.09032
1990	-5.6357
1991	-1.51443
1992	-0.41012
1993	4.94878
1994	2.81444
1995	-6.56234
1996	-6.91091
1997	-8.68434
1998	-8.55872
1999	-6.5268
2000	-10.1339
2001	-10.08368
2002	-5.37673
2003	-5.95864
2004	-6.25649
2005	-7.46081
2006	-9.26661
2007	-10.05681
2008	-12.23048
2009	-10.79838
2010	-12.9129
2011	-17.19611
2012	-13.33101
2013	-13.28222
2014	-14.70434
2015	-11.02643
2016	-8.80893
2017	-11.53749