Year	Percent
1960	-2.95939
1961	-0.94789
1962	-1.40862
1963	-1.73576
1964	-2.10622
1965	0.40821
1966	-3.47847
1967	-2.84386
1968	-2.96725
1969	-6.22488
1970	-3.14696
1971	-2
1972	-1.57408
1973	-1.21169
1974	-7.46708
1975	-7.46886
1976	-2.33421
1977	3.65864
1978	-4.77441
1979	-12.04306
1980	-22.58031
1981	-16.0767
1982	-18.90103
1983	-15.10267
1984	-5.93967
1985	-11.95319
1986	-11.61115
1987	-10.50411
1988	-10.76033
1989	-9.49657
1990	-7.88231
1991	-10.11374
1992	-9.26301
1993	-9.5455
1994	-11.80502
1995	-10.43979
1996	-8.92729
1997	-7.06132
1998	-6.00735
1999	-7.78407
2000	-10.60504
2001	-6.23622
2002	-6.50847
2003	-6.02924
2004	-8.82114
2005	-8.93023
2006	-11.00412
2007	-10.37651
2008	-13.68607
2009	-6.49241
2010	-7.25925
2011	-13.1909
2012	-11.85912
2013	-8.617
2014	-8.07336
2015	-7.53259
2016	-7.3428
2017	-7.21031