Year	Percent
1979	0.00193
1980	0.0017
1981	0.01235
1982	0.05501
1983	-0.02496
1984	0.03503
1985	0.12033
1986	0.24839
1987	-0.02335
1988	0.0209
1989	0.05244
1990	0.08498
1991	0.05626
1992	0.17794
1993	-0.02197
1994	0.20045
1995	-0.07304
1996	0.00925
1997	0.22142
1998	0.25888
1999	0.31664
2000	0.05129
2001	0.58199
2002	0.11537
2003	0.17186
2004	0.56657
2005	0.7378
2006	0.54721
2007	0.97912
2008	0.28773
2009	1.24036
2010	0.75999
2011	1.04458
2012	1.55699
2013	1.056
2014	0.52992
2015	1.05212
2016	0.61783
2017	0.29433