Year	Percent
1972	0.21304
1973	0.58069
1974	0.28561
1975	0.45853
1976	0.1586
1977	0
1978	0
1979	0
1980	0.07823
1981	-0.15928
1982	0.07279
1983	0.09729
1984	0.05396
1985	-0.01498
1986	0.06167
1987	0.01716
1988	-0.00177
1989	0.39576
1990	-0.7568
1991	0.3149
1992	-0.064
1993	-0.94607
1994	-0.37098
1995	-0.40576
1996	-0.62497
1997	0.13566
1998	0.02596
1999	0.03313
2000	0.10169
2001	0.35199
2002	0.14425
2003	-0.03597
2004	0.15944
2005	1.29631
2006	-0.91706
2007	0.28109
2008	0.05834
2009	0.30392
2010	0.10766
2011	0.10695
2012	0.01749
2013	0.04664
2014	0.23273
2015	0.00263
2016	0.00838
2017	0.01652