Year	Percent
1974	0.19538
1975	-0.30683
1976	-0.01676
1977	0.12453
1978	0.01891
1979	0.12242
1980	0.04453
1981	0.46462
1982	0.57723
1983	-0.05767
1984	0.06838
1985	0.10533
1986	-0.11098
1987	-0.0369
1988	0.27622
1989	0.17484
1990	-0.16705
1991	-0.34077
1992	0.85564
1993	0.00622
1994	0.45061
1995	-0.06981
1996	0.03859
1997	-0.01833
1998	0.20555
1999	0.21492
2000	0.40927
2001	0.12429
2002	0.71744
2003	0.5317
2004	0.91356
2005	1.32711
2006	0.8458
2007	0.69356
2008	1.35824
2009	0.68071
2010	0.06143
2011	0.32978
2012	0.39362
2013	0.22436
2014	0.17918
2015	0.22976
2016	1.52335
2017	0.2462