Year	Percent
1970	-0.18783
1971	-0.03884
1972	0.65633
1973	0.86981
1974	0.45007
1975	0.48056
1976	0.45078
1977	0.37003
1978	0.20007
1979	0.44479
1980	0.14834
1981	0.57739
1982	0.22025
1983	0.21908
1984	-0.50569
1985	0.00604
1986	0.14432
1987	0.15457
1988	0.1684
1989	0.26223
1990	0.15524
1991	-0.02019
1992	-0.2186
1993	2.16334
1994	7.32851
1995	4.79619
1996	6.28235
1997	3.67902
1998	2.96199
1999	3.86554
2000	1.56479
2001	2.19922
2002	3.93562
2003	2.27309
2004	2.39489
2005	3.39035
2006	3.91066
2007	5.37429
2008	5.74336
2009	5.32238
2010	5.73083
2011	4.27401
2012	6.119
2013	4.8702
2014	2.20857
2015	4.35518
2016	3.58114
2017	3.20238