Year	Percent
1970	0.38052
1971	0.28783
1972	0.32572
1973	0.27743
1974	0.26429
1975	0.08413
1976	0.97904
1977	1.06976
1978	0.96679
1979	1.12514
1980	1.18248
1981	0.99338
1982	0.79827
1983	0.88814
1984	1.01
1985	0.93474
1986	0.83541
1987	1.04032
1988	1.18933
1989	0.94987
1990	1.02665
1991	1.07948
1992	0.9843
1993	0.8979
1994	0.84132
1995	0.7693
1996	0.72535
1997	0.68735
1999	0.39799
2000	-0.0063
2001	0.00147
2002	0.02223
2003	0.69703
2004	0.89283
2005	0.27845
2006	1.9791
2007	0.61466
2008	1.6175
2009	0.83715
2010	0.17828
2011	0.37946
2012	0.67706
2013	1.22796
2014	1.13775
2015	0.64861
2016	1.58844
2017	2.00798