Year	Percent
1970	0.00575
1971	0
1972	0.00482
1973	0
1974	0.00331
1975	0.00856
1976	0.00301
1977	-0.00176
1978	-0.0396
1979	-0.0852
1980	-0.14293
1981	-0.136
1982	-0.03558
1983	0.00192
1984	0.05507
1985	0.0479
1986	0.0101
1987	0.04332
1988	-0.01797
1989	0.08403
1990	0.02469
1992	0.5096
1993	0.29782
1994	0.39343
1995	0.58022
1996	0.58819
1997	1.2473
1998	0.77789
1999	0.61028
2000	0.31704
2001	0.05987
2002	-0.64175
2003	0.60647
2004	0.41054
2005	0.6597
2006	1.04865
2007	0.52315
2008	0.3847
2009	0.21369
2010	0.22774
2011	0.28067
2012	0.1932
2013	0.16122
2014	0.3649
2015	0.14716
2016	0.32198
2017	0.18125