Year	Percent
1970	-0.17901
1971	1.44271
1972	-2.36138
1973	-0.43152
1974	-1.48349
1975	1.33531
1976	-2.45668
1977	-0.0071
1978	0.14431
1979	0.15812
1980	0.08207
1981	0.24414
1982	0.33568
1983	0.1095
1984	0.03209
1985	0.11737
1986	0.02721
1987	0.04631
1988	0.15232
1989	0.5057
1990	0.959
1991	3.70249
1992	1.07613
1993	0.64001
1994	1.43815
1995	1.31497
1996	3.19789
1997	7.22477
1998	5.45816
1999	2.94968
2000	4.01483
2001	3.01374
2002	0.81922
2003	1.88111
2004	1.3241
2005	1.68373
2006	0.10792
2007	1.89179
2008	0.65927
2009	-0.34477
2010	0.4026
2011	1.85003
2012	1.30768
2013	0.57816
2014	0.2353