Year	Percent
1960	-28.10046
1961	-21.25921
1962	-1.02477
1963	-12.14083
1964	-4.3557
1965	-3.22913
1966	1.33263
1967	1.80265
1968	-1.05162
1969	-4.28198
1970	-7.07994
1971	-9.22126
1972	-5.27731
1973	-6.0861
1974	3.25927
1975	-9.27666
1976	-4.06409
1977	-11.15375
1978	-14.6329
1979	-1.71745
1980	4
1981	3.70951
1982	1.92678
1983	2.13949
1984	-1.75635
1985	-3.15825
1986	-10.3172
1987	-4.13964
1988	-7.09585
1989	-9.87479
1990	-1.49334
1991	5.51806
1992	1.4501
1993	-1.35506
1994	-3.52299
1995	-2.80145
1996	5.81575
1997	9.56871
1998	0.06226
1999	5.37112
2000	21.28109
2001	14.67245
2002	9.8749
2003	14.37289
2004	14.40503
2005	23.13179
2006	26.89136
2007	22.1982
2008	19.26217
2009	-0.58103
2010	7.02243
2011	10.10163
2012	8.37612
2013	2.80897
2014	-1.70754
2015	-13.36002
2016	-14.26853
2017	-12.30511