Year	Percent
1974	0.05059
1975	0.07234
1976	0.0256
1977	0.03271
1978	0.05218
1979	0.02059
1980	0.00156
1981	0.00169
1982	0.01311
1983	0.00187
1984	0.00068
1985	0.00193
1986	0.00196
1987	0.00452
1988	0.00642
1989	0.02996
1990	-0.01776
1991	0.00426
1992	0.00545
1993	0.06663
1994	0.36112
1995	0.00842
1996	0.02532
1997	0.04277
1998	0.1877
1999	0.00646
2000	0.00636
2001	0.02124
2002	0.05353
2003	0.04562
2004	-0.18493
2005	0.32515
2006	0.84717
2007	-4.65567
2008	-0.84571
2009	-0.17506
2010	0.0076
2011	0.95336
2012	0.65341
2013	0.4879
2014	0.56113
2015	0.13527
2016	0.44082
2017	0.26526