Year	Percent
1960	-9.35799
1961	-9.9221
1962	-11.72467
1963	-10.71036
1964	-7.41762
1965	-7.20241
1966	-9.77699
1967	-10.56912
1968	-12.4969
1969	-11.84433
1970	-9.68942
1971	-10.35156
1972	-4.84999
1973	-3.74717
1974	-11.09278
1975	-8.68626
1976	-2.83351
1977	-1.88766
1978	-4.33639
1979	-7.44842
1980	-8.67136
1981	-7.24941
1982	-5.53549
1983	-2.06698
1984	0.88947
1985	1.44006
1986	4.21189
1987	6.53617
1988	6.67028
1989	2.163
1990	-0.5812
1991	-2.08387
1992	-0.23512
1993	0.67906
1994	-0.37612
1995	-0.91808
1996	-2.9349
1997	-0.67893
1998	10.79083
1999	5.69207
2000	2.07056
2001	1.55383
2002	1.5
2003	2.01134
2004	3.82892
2005	2.43501
2006	0.78118
2007	1.12635
2008	-0.01074
2009	4.68688
2010	3.1849
2011	1.4949
2012	2.79428
2013	4.97941
2014	5.25384
2015	6.96126
2016	6.85557
2017	5.40273