Year	Percent
1970	-0.02773
1971	-0.00466
1972	-0.00219
1973	-0.12757
1974	-0.07667
1975	-0.33377
1976	0.0076
1977	0.02213
1978	0.00126
1979	0.00426
1980	0.00286
1981	0.01072
1982	0.00568
1983	0.00362
1984	-0.01006
1985	0.00081
1986	0.00414
1987	0.02334
1988	0.00038
1989	0.00407
1990	0.00023
2004	0.81905
2005	1.03153
2006	0.58796
2007	1.09388
2008	1.40996
2009	1.43139
2010	1.00796
2011	1.12086
2012	1.55963
2013	2.18685
2014	2.03786
2015	1.84608
2016	0.08537
2017	-2.54527