Year	Percent
1960	0.78892
1961	0.31862
1962	1.06242
1963	2.64008
1964	1.35082
1965	-13.06642
1966	-9.73199
1967	-13.73863
1968	-18.03421
1969	-21.7288
1970	-17.99688
1971	-14.63705
1972	-10.27475
1973	-21.05902
1974	-18.92037
1975	-22.13237
1976	-15.73117
1977	-10.20805
1978	-14.11486
1979	-12.86852
1980	-10.18749
1981	-11.84998
1982	-11.11758
1983	-10.1738
1984	-8.17403
1985	-5.76853
1986	-4.47841
1987	-8.18674
1988	-5.27041
1989	-3.68565
1990	-4.93428
1991	-7.87714
1992	-5.95943
1993	-7.90024
1994	-7.65102
1995	-7.78552
1996	-7.16482
1997	-4.68903
1998	-2.60498
1999	-2.54117
2000	-0.09489
2001	-2.39235
2002	-2.91596
2003	-0.75741
2004	0.07561
2005	-0.11387
2006	0.14372
2007	-0.92243
2008	-0.64589
2009	2.63181
2010	2.09144
2011	0.48796
2012	-0.00143
2013	1.81385
2014	1.41006
2015	3.01225
2016	2.0886