Year	Percent
1970	0.09121
1971	0.1444
1972	0.09136
1973	0.17709
1974	0.31189
1975	0.32995
1976	0.08797
1977	0.16691
1978	0.50933
1979	0.01854
1980	0.90981
1981	0.7184
1982	-0.00665
1983	0.17593
1984	0.21973
1985	0.06843
1986	0.08645
1987	0.10438
1988	0.05456
1989	0.12622
1990	0.02421
1991	0.16656
1992	1.44117
1993	0.21734
1994	0.90196
1995	1.60421
1996	0.70997
1997	1.52281
1998	1.186
1999	1.15945
2000	0.20327
2001	-2.89039
2002	-0.34753
2003	0.31528
2004	0.57021
2005	0.35294
2006	2.18122
2007	0.99725
2008	-0.73827
2009	0.44119
2010	-0.04298
2011	-0.0368
2012	0.73142
2013	1.77736
2014	2.19207
2015	1.73567
2016	1.51827
2017	2.12946