Year	Percent
1971	11.14457
1972	3.75916
1973	5.28021
1974	4.63851
1975	0.44332
1976	5.74601
1977	9.48318
1978	6.44768
1979	4.01495
1980	7.37709
1981	-0.91378
1982	-5.34763
1983	2.26577
1984	-6.25916
1985	2.68217
1986	6.49678
1987	4.34564
1988	4.25466
1989	5.69517
1990	-12.19587
1991	0.06651
1992	-4.76852
1993	-4.85588
1994	5.35181
1995	3.171
1996	1.34801
1997	1.28773
1998	7.5659
1999	1.37788
2000	6.91102
2001	0.99946
2002	-1.42426
2003	4.14501
2004	6.78663
2005	4.78963
2006	5.85503
2007	2.74878
2008	6.59398
2009	0.87491
2010	0.69531
2011	-0.47028
2012	1.53698
2013	-1.12554
2014	5.66442
2015	0.63367
2016	7.52503