Year	Percent
1971	2.94365
1972	3.80248
1973	4.44802
1974	0.85076
1975	-0.49643
1976	5.40021
1977	3.58144
1978	3.09818
1979	4.10433
1980	1.19869
1981	0.37624
1982	-0.30006
1983	1.83903
1984	3.17899
1985	2.55688
1986	2.24054
1987	1.2465
1988	3.30286
1989	3.09618
1990	4.35164
1991	4.34522
1992	1.15177
1993	-1.60514
1994	2.10261
1995	1.43907
1996	0.52648
1997	1.70029
1998	1.96418
1999	1.92124
2000	2.8227
2001	1.52454
2002	-0.16799
2003	-0.76486
2004	1.19194
2005	0.76391
2006	3.8172
2007	3.39871
2008	1.2747
2009	-5.37941
2010	4.2395
2011	5.59948
2012	0.30352
2013	0.21572
2014	1.50565
2015	0.86621
2016	1.12403
2017	1.79471