Year	Percent
1975	-3.71782
1976	15.47486
1977	6.76049
1978	2.95621
1979	18.3831
1980	-10.01435
1981	-22.28539
1982	0.90899
1983	-2.34488
1984	-2.208
1985	-4.24842
1986	-5.4364
1987	-0.84566
1988	-1.72971
1989	-3.84945
1990	-1.75086
1991	0.24494
1992	1.81844
1993	-2.46799
1994	0.37585
1995	1.78335
1996	0.34366
1997	-3.78853
1998	-2.79641
1999	0.82018
2000	0.7038
2001	0.66691
2002	1.85076
2003	1.0048
2004	-1.21044
2005	-1.16164
2006	2.96195
2007	-1.07817
2008	-3.07429
2009	-2.92154
2010	1.3081
2011	2.33638
2012	-0.53491
2013	-3.56573
2014	-3.77001
2015	-1.95707
2016	-3.7686
2017	0.02851