Year	Percent
1960	-8.63079
1961	-10.61992
1962	-11.98068
1963	-11.54545
1964	-27.18246
1965	-24.5943
1966	-0.81823
1967	1.33535
1968	6.11967
1969	8.13879
1970	5.88711
1971	8.7567
1972	5.85883
1973	4.09433
1974	1.22084
1975	-5.69892
1976	-0.19782
1977	-6.86427
1978	-2.31135
1979	-0.31928
1980	-5.40949
1981	-13.94747
1982	-15.40731
1983	-14.6899
1984	-5.42151
1985	-3.16061
1986	-0.10662
1987	5.44471
1988	4.92721
1989	9.87613
1990	-2.39763
1991	-9.95093
1992	-5.10793
1993	-1.83003
1994	-3.4616
1995	-4.35715
1996	-7.41091
1997	-9.60144
1998	-21.37611
1999	-6.40213
2000	-13.47025
2001	-30.85556
2002	-20.7978
2003	-25.81
2004	-22.00955
2005	-14.73437
2006	16.84963
2007	6.8726
2008	4.65044
2009	0.32901
2010	14.13324
2011	13.70592
2012	5.66508
2013	-2.54991
2014	-7.95652
2015	-17.51865
2016	-4.53477
2017	8.2878